ifcpatch.execute - make input attribute optional

e.g. MergeDuplicateTypes  doesn't use it in the code either way

src/ifcpatch/ifcpatch/__init__.py

@@ -69,13 +69,12 @@ def execute(args):
     if "log" in args:
         logging.basicConfig(filename=args["log"], filemode="a", level=logging.DEBUG)
     logger = logging.getLogger("IFCPatch")
-    ifc_file = args["input"]
     recipes = getattr(__import__("ifcpatch.recipes.{}".format(args["recipe"])), "recipes")
     recipe = getattr(recipes, args["recipe"])
     if recipe.Patcher.__init__.__doc__ is not None:
-        patcher = recipe.Patcher(args["input"], args["file"], logger, *args["arguments"])
+        patcher = recipe.Patcher(args.get("input"), args["file"], logger, *args["arguments"])
     else:
-        patcher = recipe.Patcher(args["input"], args["file"], logger, args["arguments"])
+        patcher = recipe.Patcher(args.get("input"), args["file"], logger, args["arguments"])
     patcher.patch()
     output = getattr(patcher, "file_patched", patcher.file)
     return output

src/ifcpatch/ifcpatch/recipes/MergeDuplicateTypes.py

@@ -53,10 +53,10 @@ class Patcher:
         .. code:: python
 
             # Default behaviour of merging by Tag attribute
-            ifcpatch.execute({"input": "input.ifc", "file": model, "recipe": "MergeDuplicateTypes", "arguments": []})
+            ifcpatch.execute({"file": model, "recipe": "MergeDuplicateTypes", "arguments": []})
 
             # Explicitly say we want to merge based on the Name attribute
-            ifcpatch.execute({"input": "input.ifc", "file": model, "recipe": "MergeDuplicateTypes", "arguments": ["Name"]})
+            ifcpatch.execute({"file": model, "recipe": "MergeDuplicateTypes", "arguments": ["Name"]})
         """
         self.src = src
         self.file = file