Do not test the maxImageMeta limit when there is no limit

Change-Id: I6e7797a5dd60da8e5c69caab2224ab27add8a2f4
Closes-Bug: #1400383
diff --git a/tempest/api/compute/limits/test_absolute_limits_negative.py b/tempest/api/compute/limits/test_absolute_limits_negative.py
index f729436..a9c72fb 100644
--- a/tempest/api/compute/limits/test_absolute_limits_negative.py
+++ b/tempest/api/compute/limits/test_absolute_limits_negative.py
@@ -32,6 +32,10 @@
         # Get max limit value
         max_meta = self.client.get_specific_absolute_limit('maxImageMeta')
 
+        # No point in running this test if there is no limit.
+        if int(max_meta) == -1:
+            raise self.skipException('no limit for maxImageMeta')
+
         # Create server should fail, since we are passing > metadata Limit!
         max_meta_data = int(max_meta) + 1