Fix error message creating texture style without render style

It was suggesting that it's possible to create it with just shading style though it's not currently supported.

Now it also appears when user is about to enable texture style editing, not when they're already trying to save the changes.

src/bonsai/bonsai/bim/module/style/operator.py

@@ -680,11 +680,23 @@ class EnableEditingSurfaceStyle(bpy.types.Operator):
     def execute(self, context):
         props = bpy.context.scene.BIMStylesProperties
         style = tool.Ifc.get().by_id(self.style)
+        style_elements = tool.Style.get_style_elements(style)
+
+        if self.ifc_class == "IfcSurfaceStyleWithTextures":
+            rendering_style = style_elements.get("IfcSurfaceStyleRendering", None)
+            # TODO: support creating texture styles without defining rendering style first.
+            if rendering_style is None:
+                self.report(
+                    {"ERROR"},
+                    "Editing texture style without defining rendering style is not yet supported. "
+                    "Define render style first",
+                )
+                return {"CANCELLED"}
+
         props.is_editing_style = self.style
         props.is_editing_class = self.ifc_class
         tool.Style.set_surface_style_props()
 
-        style_elements = tool.Style.get_style_elements(style)
         surface_style = style_elements.get(self.ifc_class, None)
         attributes = tool.Style.get_style_ui_props_attributes(self.ifc_class)
 
@@ -736,9 +748,12 @@ class EditSurfaceStyle(bpy.types.Operator, tool.Ifc.Operator):
         self.texture_style = style_elements.get("IfcSurfaceStyleWithTextures", None)
 
         if self.surface_style:
-            self.edit_existing_style()
+            result = self.edit_existing_style()
         else:
-            self.add_new_style()
+            result = self.add_new_style()
+
+        if result:
+            return result
 
         self.props.is_editing_style = 0
         core.load_styles(tool.Style, style_type=self.props.style_type)
@@ -773,14 +788,6 @@ class EditSurfaceStyle(bpy.types.Operator, tool.Ifc.Operator):
         elif self.props.is_editing_class == "IfcSurfaceStyleWithTextures":
             # TODO: fix same issues as with creating new IfcSurfaceStyleWithTextures
             material = tool.Ifc.get_object(self.style)
-            shading_style = self.rendering_style or self.shading_style
-            if self.rendering_style is None:
-                self.report(
-                    {"ERROR"},
-                    "Editing texture styles without defining shading/rendering style is not yet supported. "
-                    "Define shading/render style first",
-                )
-                return {"CANCELLED"}
             textures = tool.Ifc.run("style.add_surface_textures", textures=self.get_texture_attributes(), uv_maps=[])
             texture_style = tool.Ifc.run(
                 "style.add_surface_style",
@@ -788,7 +795,7 @@ class EditSurfaceStyle(bpy.types.Operator, tool.Ifc.Operator):
                 ifc_class="IfcSurfaceStyleWithTextures",
                 attributes={"Textures": textures},
             )
-            tool.Loader.create_surface_style_with_textures(material, shading_style, texture_style)
+            tool.Loader.create_surface_style_with_textures(material, self.rendering_style, texture_style)
         else:
             attributes = tool.Style.get_style_ui_props_attributes(self.surface_style.is_a())
             ifcopenshell.api.run(
@@ -821,15 +828,6 @@ class EditSurfaceStyle(bpy.types.Operator, tool.Ifc.Operator):
         elif self.props.is_editing_class == "IfcSurfaceStyleWithTextures":
             # TODO: provide `uv_maps` - need to rework .get_uv_maps not to depend on a single representation
             material = tool.Ifc.get_object(self.style)
-            shading_style = self.rendering_style or self.shading_style
-            # TODO: support creating texture styles without defining rendering style first
-            if self.rendering_style is None:
-                self.report(
-                    {"ERROR"},
-                    "Creating texture styles without defining shading/rendering style is not yet supported. "
-                    "Define shading/render style first",
-                )
-                return {"CANCELLED"}
             textures = self.get_texture_attributes()
             if not textures:
                 self.report({"ERROR"}, "Cannot create texture style without any textures.")
@@ -841,7 +839,7 @@ class EditSurfaceStyle(bpy.types.Operator, tool.Ifc.Operator):
                 ifc_class="IfcSurfaceStyleWithTextures",
                 attributes={"Textures": textures},
             )
-            tool.Loader.create_surface_style_with_textures(material, shading_style, texture_style)
+            tool.Loader.create_surface_style_with_textures(material, self.rendering_style, texture_style)
         else:
             attributes = tool.Style.get_style_ui_props_attributes(self.props.is_editing_class)
             surface_style = ifcopenshell.api.run(