on exception return empty graph

apps/monitor/views.py

@@ -1,6 +1,7 @@
 from django.shortcuts import render, redirect
 from django.contrib.auth.decorators import login_required
 from django.conf import settings
+from django.http import HttpResponse
 import pytz
 from apps.transactions.models import Transaction
 from apps.rates.models import ExchangeRate
@@ -45,6 +46,7 @@ def graph(request):
     Crypto = request.GET['crypto']
     Fiat = request.GET['fiat']
 
+    try:
         if Crypto == "WALLET":
             if 'number_of_days' in request.GET:
                 return Graph().wallet_graph_days(request.user.id, Fiat, request.GET['number_of_days'])
@@ -53,3 +55,6 @@ def graph(request):
                 return Graph().graph_days(Crypto, Fiat, request.GET['number_of_days'])
             if 'number_of_hours' in request.GET:
                 return Graph().graph_hours(Crypto, Fiat, request.GET['number_of_hours'])
+    except:
+        response = HttpResponse(content_type = 'image/png')
+        return response