scripts/jenkins-gerrit: make assert more verbose

Change-Id: I0ea40663220f7eb8ee72e43f3f6b776be5835db2
---
M scripts/jenkins-gerrit/comment_generate.py
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/scripts/jenkins-gerrit/comment_generate.py b/scripts/jenkins-gerrit/comment_generate.py
index e96893c..147faac 100755
--- a/scripts/jenkins-gerrit/comment_generate.py
+++ b/scripts/jenkins-gerrit/comment_generate.py
@@ -97,7 +97,8 @@
                 assert stage in ret, f"found result for stage {stage}, but" \
                         " didn't find where it was started. The" \
                         " re_start_build regex probably needs to be adjusted" \
-                        " to match the related gerrit-*-build job."
+                        " to match the related gerrit-*-build job.\n\n" \
+                        f"ret: {ret}"
                 ret[stage]["passed"] = (match.group(2) == "SUCCESS")
 
     return ret

