handle non numeric id for namespace

the default placeholder namespace_id is non numeric and breaks when we
attempt to load record from db. This is actually an invalid id and we
should not really be attempting to load from db.

Change-Id: If5305457291e779804434dd93f9dcf2e075fb903

apps/beeswax/src/beeswax/common.py

@@ -20,6 +20,7 @@
 """
 from __future__ import print_function
 
+import numbers
 import re
 import time
 
@@ -120,7 +121,7 @@ def find_compute(cluster=None, user=None, dialect=None, namespace_id=None):
 
     # If found, we will attempt to reload it, first by id then by name
     if selected_compute:
-      if selected_compute.get('id'):
+      if selected_compute.get('id') and isinstance(selected_compute['id'], numbers.Integral):
         c = Compute.objects.filter(id=selected_compute['id']).first()
         if c:
           return c.to_dict()
@@ -138,7 +139,7 @@ def find_compute(cluster=None, user=None, dialect=None, namespace_id=None):
 
   # We will attempt to find a default compute based on other criteria
   ns = None
-  if namespace_id:
+  if namespace_id and isinstance(namespace_id, numbers.Integral):
     ns = Namespace.objects.filter(id=namespace_id).first()
 
   if not ns and dialect: