Resolve "Serverside rendering of preview images"

Closes #66 (closed)

preview_worker/worker.py

@@ -53,13 +53,16 @@ def worker():
         print("Working on %s" % uuid)
         uhepp_obj = psql.query(UheppPlot).filter(UheppPlot.uuid == uuid).first()
 
-        plot = uhepp.from_data(uhepp_obj.uhepp)
-        fig, ax = plot.render()
+        try:
+            plot = uhepp.from_data(uhepp_obj.uhepp)
+            fig, ax = plot.render()
 
-        buf = io.BytesIO()
-        fig.savefig(buf, format="png", dpi=30)
+            buf = io.BytesIO()
+            fig.savefig(buf, format="png", dpi=30)
 
-        uhepp_obj.preview = buf.getvalue()
+            uhepp_obj.preview = buf.getvalue()
+        except Exception as e:
+            uhepp_obj.preview = b"!error"
 
         psql.add(uhepp_obj)
         psql.commit()