Fix bug in dependency update workflow. (#685)

* Fix bug with logfile if --skip_android is set.
* Fix workflow to handle missing logfile.

Author: jonsimantov

.github/workflows/update-dependencies.yml

@@ -87,13 +87,16 @@ jobs:
             echo "::error ::Neither Android nor iOS selected. Exiting."
             exit 1
           fi
+          touch ${UPDATE_LOGFILE}  # In case it wasn't generated before
+          cat ${UPDATE_LOGFILE}
 
       - name: Push branch if there are changes
         id: push-branch
         run: |
           if ! git update-index --refresh; then
             # Do a bit of post-processing on the update log to split it by platform.
             UPDATE_LOGFILE_PROCESSED=update_log_processed.txt
+            touch "${UPDATE_LOGFILE_PROCESSED}"
             if grep -q ^Android: "${UPDATE_LOGFILE}"; then
               echo "### Android" >> "${UPDATE_LOGFILE_PROCESSED}"
               echo "" >> "${UPDATE_LOGFILE_PROCESSED}"

scripts/update_android_ios_dependencies.py

@@ -738,6 +738,8 @@ def parse_cmdline_args():
 logfile_lines = set()
 
 def main():
+  global logfile_lines
+
   args = parse_cmdline_args()
   # Readme files have to be updated for both Android and iOS dependencies.
   readme_files = get_files(args.readmefiles, file_extension='.md',
@@ -772,9 +774,9 @@ def main():
     for gradle_file in gradle_files:
       modify_gradle_file(gradle_file, latest_android_versions_map, args.dryrun)
 
-    if args.logfile:
-      with open(args.logfile, 'w') as logfile_file:
-        logfile_file.write("\n".join(sorted(list(logfile_lines))) + "\n")
+  if args.logfile:
+    with open(args.logfile, 'w') as logfile_file:
+      logfile_file.write("\n".join(sorted(list(logfile_lines))) + "\n")
 
 if __name__ == '__main__':
   main()