Fix release based releases without label

If not explicit label or name is given, use filename of download url
for asset pattern matching.

Author: deathaxe

package_control/clients/github_client.py

@@ -244,7 +244,10 @@ def _get_releases(user_repo, tag_prefix=None, page_size=1000):
                         version,
                         release['published_at'][0:19].replace('T', ' '),
                         [
-                            ((a['label'], a['browser_download_url']))
+                            (
+                                a['label'] or a['browser_download_url'].rpartition("/")[-1],
+                                a['browser_download_url']
+                            )
                             for a in release['assets']
                             if a['state'] == 'uploaded'
                         ]

package_control/clients/gitlab_client.py

@@ -245,7 +245,10 @@ def _get_releases(user_repo, tag_prefix=None, page_size=1000):
                         version,
                         release['released_at'][0:19].replace('T', ' '),
                         [
-                            ((a['name'], a['direct_asset_url']))
+                            (
+                                a['name'] or a['direct_asset_url'].rpartition("/")[-1],
+                                a['direct_asset_url']
+                            )
                             for a in release['assets']['links']
                         ]
                     )