Updated PolicyCheck return codes and simplified duplicate code

Author: Alex-1089

src/scanoss/cli.py

@@ -1846,7 +1846,8 @@ def inspect_dep_track_project_violations(parser, args):
     """
     if not args.project_id and not args.project_name and not args.project_version:
         print_stderr(
-            'Please specify either a project ID (--project-id) or a project name (--project-name) and version (--project-version)'
+            'Please specify either a project ID (--project-id) or a project name (--project-name) and '
+            'version (--project-version)'
         )
         parser.parse_args([args.subparser, '-h'])
         sys.exit(1)

src/scanoss/inspection/dependency_track/project_violation.py

@@ -29,7 +29,6 @@
 It retrieves, processes, and formats policy violations from a Dependency Track instance
 for a specific project.
 """
-
 import json
 import time
 from datetime import datetime
@@ -294,7 +293,6 @@ def _wait_processing_by_project_status(self):
             time.sleep(PROCESSING_RETRY_DELAY)
             self.print_debug('Checking if complete...')
         # End while loop
-        return
 
     def _wait_project_processing(self):
         """