Check result of bitmap size operation for failure

Fixes #5046
// FREEBIE

src/org/thoughtcrime/securesms/util/BitmapDecodingException.java

@@ -1,7 +1,12 @@
 package org.thoughtcrime.securesms.util;
 
-public class BitmapDecodingException extends Throwable {
+public class BitmapDecodingException extends Exception {
+
   public BitmapDecodingException(String s) {
     super(s);
   }
+
+  public BitmapDecodingException(Exception nested) {
+    super(nested);
+  }
 }