More reliable way to get bbim package name #5214

See #5214 for details, can't rely on 'bpy.context.preferences.addons' as it may contain a missing addons too (if addon was manually uninstalled and it won't be able to load but it will still appear in 'addons').

src/ifcsverchok/__init__.py

@@ -36,7 +36,7 @@ import bpy
 logger = logging.getLogger("sverchok.ifc")
 
 
-def get_blender_addon_package_name(addon_name: str) -> types.ModuleType:
+def get_blender_addon_package_by_name(addon_name: str) -> types.ModuleType:
     # Check for legacy addons.
     if addon_name in bpy.context.preferences.addons:
         return importlib.import_module(addon_name)
@@ -44,20 +44,23 @@ def get_blender_addon_package_name(addon_name: str) -> types.ModuleType:
         raise ModuleNotFoundError
 
     # Check for Blender extensions.
-    bbim_package_name = None
+    addon_package = None
     for package_name in bpy.context.preferences.addons.keys():
         if package_name.endswith(f".{addon_name}"):
-            bbim_package_name = package_name
-    if bbim_package_name is None:
+            try:
+                addon_package = importlib.import_module(package_name)
+            except ModuleNotFoundError:
+                pass
+    if addon_package is None:
         raise ModuleNotFoundError
-    return importlib.import_module(bbim_package_name)
+    return addon_package
 
 
 def ensure_addons_are_enabled(*addon_names: str) -> None:
     errors = []
     for addon_name in addon_names:
         try:
-            module = get_blender_addon_package_name(addon_name)
+            module = get_blender_addon_package_by_name(addon_name)
             # `__addon_enabled__` is not present if addon wasn't enabled before
             if not getattr(module, "__addon_enabled__", False):
                 errors.append(f"- Addon {addon_name} appears to be disabled, it should be enabled before IFC Sverchok.")