views: report error when spaces are found in image name

Validate imagen names in POST /action/image/create.
Remove spaces at the begining and end of the image name, then
report error if the image name still contains space characters.

ogcp/views.py

@@ -1683,12 +1683,17 @@ def action_image_create():
         if r.status_code != requests.codes.ok:
             return ogserver_error('commands')
 
+        image_name = form.name.data.strip()
+        if ' ' in image_name:
+            flash(_('No spaces allowed in image names'), category='error')
+            return redirect(url_for('commands'))
+
         disk, partition, code = form.os.data.split(' ')
         payload = {"clients": [ip],
                    "disk": disk,
                    "partition": partition,
                    "code": code,
-                   "name": form.name.data,
+                   "name": image_name,
                    "repository_id": int(form.repository.data),
                    "id": "0", # This is ignored by the server.
                    "description": form.description.data,