Prevent crash

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

@@ -615,7 +615,9 @@ public class AdapterMessage extends PagedListAdapter<TupleMessageEx, AdapterMess
                     int px = (int) (24 * scale + 0.5f);
 
                     if (source != null && source.startsWith("cid")) {
-                        String cid = "<" + source.split(":")[1] + ">";
+                        String[] cids = source.split(":");
+                        if (cids.length > 1) {
+                            String cid = "<" + cids[1] + ">";
                             EntityAttachment attachment = DB.getInstance(context).attachment().getAttachment(message.id, cid);
                             if (attachment == null || !attachment.available) {
                                 Drawable d = context.getResources().getDrawable(R.drawable.baseline_warning_24, context.getTheme());
@@ -632,6 +634,7 @@ public class AdapterMessage extends PagedListAdapter<TupleMessageEx, AdapterMess
                                 return d;
                             }
                         }
+                    }
 
                     if (properties.showImages(message.id)) {
                         // Get cache folder