Az/fix meta requests (#903)

* fixed processing of meta requests

cvat/apps/auto_annotation/views.py

@@ -129,7 +129,7 @@ def delete_model(request, mid):
 @login_required
 def get_meta_info(request):
     try:
-        tids = json.loads(request.body.decode('utf-8'))
+        tids = request.data
         response = {
             "admin": has_admin_role(request.user),
             "models": [],

cvat/apps/auto_segmentation/views.py

@@ -195,7 +195,7 @@ def create_thread(tid, labels_mapping, user):
 def get_meta_info(request):
     try:
         queue = django_rq.get_queue('low')
-        tids = json.loads(request.body.decode('utf-8'))
+        tids = request.data
         result = {}
         for tid in tids:
             job = queue.fetch_job('auto_segmentation.create/{}'.format(tid))

cvat/apps/tf_annotation/views.py

@@ -228,7 +228,7 @@ def create_thread(tid, labels_mapping, user):
 def get_meta_info(request):
     try:
         queue = django_rq.get_queue('low')
-        tids = json.loads(request.body.decode('utf-8'))
+        tids = request.data
         result = {}
         for tid in tids:
             job = queue.fetch_job('tf_annotation.create/{}'.format(tid))