remove redirects to request.url's cause those cause unpredictable

behavior depending on how nginx is set up

app.py

@@ -97,11 +97,12 @@ def image():
 
     if request.method == 'POST':
         if 'image' not in request.files:
-            return redirect(request.url)
+            return render_image_template()
+
         file = request.files['image']
 
         if file.filename == '':
-            return redirect(request.url)
+            return render_image_template()
         if file:
             extension = os.path.splitext(file.filename)[1]