Update 30_update_plex.sh

Added check in case json version comes back blank echoes error and skips update to prevent wget loop.

init/30_update_plex.sh

@@ -23,7 +23,9 @@ else
 fi
 
 last=130
-if [[ "$VERSION" != "$INSTALLED" ]]; then
+if [[ "$VERSION" == "" ]]; then
+  echo "ERROR: No version found, running installed version $INSTALLED"
+elif [[ "$VERSION" != "$INSTALLED" ]]; then
   echo "Upgrading from version: $INSTALLED to version: $VERSION"
     while [[ $last -ne "0" ]]; do
 	  rm -f /tmp/plexmediaserver_*.deb