corrs: Handle JSONDecodeError

In the case that the JSON output from the correlations computation is
malformed, we capture that into a new exception an re-raise it to help
with debugging and fixing issues.

1 files changed, 7 insertions, 3 deletions

diff --git a/wqflask/wqflask/views.py b/wqflask/wqflask/views.py
index f2d20eef..c71ae3c3 100644
--- a/wqflask/wqflask/views.py
+++ b/wqflask/wqflask/views.py
@@ -901,9 +901,13 @@ def corr_compute_page():
             return render_template("correlation_page.html", **output)
 
         if jobs.completed_erroneously(job):
-            ## The "parseable" error report is actually in STDOUT
-            output = json.loads(job.get("stdout", "{}"))
-            return render_template("correlation_error_page.html", error=output)
+            try:
+                ## The "parseable" error report is actually in STDOUT
+                output = json.loads(job.get("stdout") or "{}")
+                return render_template(
+                    "correlation_error_page.html", error=output)
+            except json.decoder.JSONDecodeError as jde:
+                raise Exception(f"STDOUT: {job.get('stdout')}") from jde
 
         return render_template("loading_corrs.html")