model override-by-name: skip nameless base functions

`base_function["Name"]` crashes with `KeyError` when the model has
a function without an explicit `Name` (e.g. the binary entry stub).
Skip those entries silently; only named functions can be matched
by name anyway.

python/revng/internal/cli/_commands/override_by_name.py

@@ -87,6 +87,8 @@ class ModelOverrideByName(Command):
                     return 1
 
                 for base_function in base_model["Functions"]:
+                    if "Name" not in base_function:
+                        continue
                     if base_function["Name"] == function_name:
                         function_to_override["Entry"] = base_function["Entry"]
                         function_to_override["Name"] = base_function["Name"]