Merge branch 'fix-adding-empty-input-group' into '2.8.2-DEVELOPMENT'

I'm seeing empty input groups in the manifest still, trying a fix

See merge request !1423

apps/cli/executables/pexable/ingest_envoy/ingest_envoy/ingestion_manifest.py

@@ -182,7 +182,7 @@ class IngestionManifest(ManifestComponentIF):
         }
 
         # Ingestion manifests with empty input groups can cause errors on ingest
-        if me_dict[IngestionManifestKey.INPUT_GROUP.value]:
+        if len(self.input_group.science_products) > 0:
             to_return[IngestionManifestKey.INPUT_GROUP.value] = me_dict[
                 IngestionManifestKey.INPUT_GROUP.value
             ].to_json()