Add some logging.

py/kubeflow/testing/tekton_client.py

@@ -7,6 +7,7 @@
 import os
 from multiprocessing import Pool
 import re
+import traceback
 from xml.etree import ElementTree as ET
 import yaml
 
@@ -245,7 +246,8 @@ def run(self):
         logging.error("Could not create workflow: %s", e)
       raise
 
-    self.name = result.metadata["name"]
+    self.name = result.get("metadata", {}).get("name")
+    logging.info("Submitted Tekton Pipeline %s.%s", self.namespace, self.name)
     return result
 
   def append_teardown(self, runner):
@@ -317,7 +319,8 @@ def run(self, tekton_cluster_info, current_cluster_info):
           urls[w.teardown_runner.name] = w.teardown_runner.ui_url
         logging.info("URL for workflow: %s", w.ui_url)
     except Exception as e: # pylint: disable=broad-except
-      logging.error("Error when starting Tekton workflow: %s", e)
+      logging.error("Error when starting Tekton workflow: %s;\nstacktrace:\n%s",
+                    e, traceback.format_exc())
     finally:
       # Restore kubectl
       util.configure_kubectl(current_cluster_info.project,