Modified how attachments are pushed to the API.

Added support for BMP and GIF image types.

PWAPPv2/MainWindow.xaml.cs

@@ -59,11 +59,22 @@ namespace PWAPPv2
             SupportedImageTypes.Add(".jpeg");
             SupportedImageTypes.Add(".jpg");
             SupportedImageTypes.Add(".png");
+            SupportedImageTypes.Add(".gif");
+            SupportedImageTypes.Add(".bmp");
 
 
             try
             {
                 args = App.Args;
+                if(args.Length == 0)
+                {
+                    throw new NoArgumentsException();
+                }
+            }
+            catch (NoArgumentsException)
+            {
+                System.Windows.MessageBox.Show("No Patient ID was selected.\nPlease select a patient and retry the referral.");
+                return;
             }
             catch (Exception)
             { }
@@ -431,4 +442,9 @@ namespace PWAPPv2
 
         }
     }
+
+    public class NoArgumentsException : Exception
+    {
+
+    }
 }