Job submission code and API cleanup (#127)

* Refactor add jobs and make add_job api only be one job (instead of a list)

* Renamed to JobImportHandler and misc cleanup

* Dont bury exceptions in server proxy post_job

* Update code to create child jobs in a cleaner manner

src/utilities/misc_helper.py

@@ -211,7 +211,7 @@ def check_for_updates(repo_name, repo_owner, app_name, current_version):
 
     releases = get_github_releases(repo_owner, repo_name)
     if not releases:
-        return
+        return None
 
     latest_version = releases[0]
     latest_version_tag = latest_version['tag_name']
@@ -221,7 +221,7 @@ def check_for_updates(repo_name, repo_owner, app_name, current_version):
         logger.info(f"Newer version of {app_name} available. "
                     f"Latest: {latest_version_tag}, Current: {current_version}")
         return latest_version
-
+    return None
 
 def is_localhost(comparison_hostname):
     # this is necessary because socket.gethostname() does not always include '.local' - This is a sanitized comparison