Further refine error message and update integration tests

Fix test with spaces

pep8 failure

More test tweaks

Even more test fixes

awx_collection/tests/integration/targets/tower_label/tasks/main.yml

@@ -12,13 +12,16 @@
 - name: Check module fails with correct msg
   tower_label:
     name: "Test Label"
-    organization: "Non existing org"
+    organization: "Non_existing_org"
     state: present
   register: result
   ignore_errors: true
 
 - assert:
     that:
-      - "'Non existing org was not found on the Tower server' in result.msg"
+      - "result is failed"
+      - "result is not changed"
+      - "'Non_existing_org' in result.msg"
+      - "result.total_results == 0"
 
 # TODO: Deleting labels doesn't seem to work currently