Fix unwanted file upload when drive is offline

Step 1: Configure Nuxeo drive.
Step 2: Upload one file "file1.txt"
Step 3: Make sure file is uploaded.
Step 4: Disable network cable. (or disable Network interface). As network is down, drive icon turn's to gray.
Step 5: Create a folder inside Nuxeo drive "Folder1"
Step 6: Upload one file "file2.txt" inside "Folder1"
Step 7: wait for 15 minutes with network down

Expected: When network is down, drive is not suppose to try uploading files, which in turn results in incremented blacklist count.
Current: creating folder when network is down, results in enabling engine, due to which file upload blacklist count is incremented and errors are displayed in context menu.