Allow sending invalid iCalendar files

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -1382,7 +1382,8 @@ public class MessageHelper {
 
         for (EntityAttachment attachment : attachments)
             if (attachment.available &&
-                    "text/calendar".equals(attachment.type)) {
+                    "text/calendar".equals(attachment.type))
+                try {
                     File file = attachment.getFile(context);
                     ICalendar icalendar = CalendarHelper.parse(context, file);
                     Method method = (icalendar == null ? null : icalendar.getMethod());
@@ -1394,6 +1395,8 @@ public class MessageHelper {
                                 " charset=UTF-8;");
                         altMultiPart.addBodyPart(calPart);
                     }
+                } catch (Throwable ex) {
+                    Log.w(ex);
                 }
 
         int availableAttachments = 0;