refactor fixes (#3923)

* refactor fixes

* pre commit fixes

* cr fixes

* cr fixes

demisto_sdk/commands/content_graph/parsers/pack.py

@@ -250,8 +250,8 @@ def __init__(self, path: Path, git_sha: Optional[str] = None) -> None:
         self.relationships: Relationships = Relationships()
         self.connect_pack_dependencies(metadata)
         try:
-            self.contributors: List[str] = get_json(
-                path / PACK_CONTRIBUTORS_FILENAME, git_sha=git_sha
+            self.contributors: List[str] = (
+                get_json(path / PACK_CONTRIBUTORS_FILENAME, git_sha=git_sha) or []
             )
         except FileNotFoundError:
             logger.debug(f"No contributors file found in {path}")

demisto_sdk/commands/validate/initializer.py

@@ -341,6 +341,10 @@ def get_files_from_git(self) -> Set[BaseContent]:
             renamed_files,
             deleted_files,
         ) = self.collect_files_to_run(self.file_path)
+        modified_files = self.filter_files(modified_files)
+        added_files = self.filter_files(added_files)
+        renamed_files = self.filter_files(renamed_files)
+        deleted_files = self.filter_files(deleted_files)
         basecontent_with_path_set: Set[BaseContent] = set()
         basecontent_with_path_set = basecontent_with_path_set.union(
             self.paths_to_basecontent_set(
@@ -400,3 +404,17 @@ def paths_to_basecontent_set(
             except InvalidContentItemException:
                 invalid_content_items.append(file_path)
         return basecontent_with_path_set
+
+    def filter_files(self, files_set: Set[Path]):
+        """Filter out all the files with suffixes that are not supported by BaseContent.
+
+        Args:
+            files_set (Set[Path]): The set of paths to filter
+
+        Returns:
+            Set: The set of filtered files.
+        """
+        extensions_list_to_filter = [".png", ".md", ".svg"]
+        return set(
+            file for file in files_set if file.suffix not in extensions_list_to_filter
+        )