Merge pull request #3372 from beeankha/jt_strings2

Update fields.py to Display Correct Error Message When JT Credential Is Not an Integer

Reviewed-by: https://github.com/softwarefactory-project-zuul[bot]

awx/api/fields.py

@@ -101,6 +101,10 @@ class DeprecatedCredentialField(serializers.IntegerField):
         super(DeprecatedCredentialField, self).__init__(**kwargs)
 
     def to_internal_value(self, pk):
+        try:
+            pk = int(pk)
+        except ValueError:
+            self.fail('invalid')
         try:
             Credential.objects.get(pk=pk)
         except ObjectDoesNotExist: