From e0c165313b361f9827149a9d459ccd2d4e1af032 Mon Sep 17 00:00:00 2001
From: "R. Miles McCain" <development-machine@sendmiles.email>
Date: Mon, 11 Jan 2021 12:11:27 -0500
Subject: [PATCH] Add fallback to percent_change_display (fixes #89)

---
 shynet/dashboard/templatetags/helpers.py | 37 +++++++++++++-----------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/shynet/dashboard/templatetags/helpers.py b/shynet/dashboard/templatetags/helpers.py
index 88b6d74..ae1bf2d 100644
--- a/shynet/dashboard/templatetags/helpers.py
+++ b/shynet/dashboard/templatetags/helpers.py
@@ -61,25 +61,28 @@ def relative_stat_tone(
 
 @register.simple_tag
 def percent_change_display(start, end):
-    if start == None or end == None:
-        return SafeString("&Delta; n/a")
-    if start == end:
-        direction = "&Delta; "
-    else:
-        direction = "&uarr; " if end > start else "&darr; "
-
-    if start == 0 and end != 0:
-        pct_change = "100%"
-    elif start == 0:
-        pct_change = "0%"
-    else:
-        change = int(round(100 * abs(end - start) / max(start, 1)))
-        if change > 999:
-            return "> 999%"
+    try:
+        if start == None or end == None:
+            return SafeString("&Delta; n/a")
+        if start == end:
+            direction = "&Delta; "
         else:
-            pct_change = str(change) + "%"
+            direction = "&uarr; " if end > start else "&darr; "
 
-    return SafeString(direction + pct_change)
+        if start == 0 and end != 0:
+            pct_change = "100%"
+        elif start == 0:
+            pct_change = "0%"
+        else:
+            change = int(round(100 * abs(end - start) / max(start, 1)))
+            if change > 999:
+                return "> 999%"
+            else:
+                pct_change = str(change) + "%"
+
+        return SafeString(direction + pct_change)
+    except: # TODO: filter for specific issues
+        return SafeString("&Delta; ?")
 
 
 @register.inclusion_tag("dashboard/includes/sidebar_footer.html")