message: android: Fix for java file check
  Skip library build directories which don't have any java files.
diff: @@ -77,7 +77,7 @@ find src/ -name "*.i" > build/upm.i.list
  gen_and_upload() {
  # Skip any directories without .java src files
  - if [ ! -f *.java ]; then
  + if [ $(ls *.java | wc -l) -eq "0" ]; then
  return
  fi
  