task #2741 fix Handle error message, provider connection when we are creating an unnamed tag

ereuse_devicehub/inventory/forms.py

@@ -1,6 +1,7 @@
 import copy
 import json
 from json.decoder import JSONDecodeError
+from requests.exceptions import ConnectionError
 
 from boltons.urlutils import URL
 from ereuse_devicehub.db import db
@@ -411,7 +412,11 @@ class TagUnnamedForm(FlaskForm):
 
     def save(self):
         num = self.amount.data
-        tags_id, _ = g.tag_provider.post('/', {}, query=[('num', num)])
+        try:
+            tags_id, _ = g.tag_provider.post('/', {}, query=[('num', num)])
+        except ConnectionError:
+            pass
+            return []
         tags = [Tag(id=tag_id, provider=g.inventory.tag_provider) for tag_id in tags_id]
         db.session.add_all(tags)
         db.session.commit()

ereuse_devicehub/inventory/views.py

@@ -256,7 +256,10 @@ class TagAddUnnamedView(View):
         context = {'page_title': 'New Unnamed Tag', 'lots': lots}
         form = TagUnnamedForm()
         if form.validate_on_submit():
-            form.save()
+            tags = form.save()
+            if not tags:
+                msg = 'Sorry, the communication with the tag server is not possible now!'
+                messages.error(msg)
             next_url = url_for('inventory.devices.taglist')
             return flask.redirect(next_url)