Promote warning to exception in convert_uudecode() function

Author: kocsismate

ext/standard/tests/strings/uuencode.phpt

@@ -10,7 +10,11 @@ var_dump(convert_uudecode("!@#$%^YUGFDFGHJKLUYTFBNMLOYT"));
 var_dump(convert_uudecode($enc));
 var_dump($enc = convert_uuencode("not very sophisticated"));
 var_dump(convert_uudecode($enc));
-var_dump(convert_uudecode(substr($enc, 0, -10)));
+try {
+    convert_uudecode(substr($enc, 0, -10));
+} catch (ValueError $exception) {
+    echo $exception->getMessage() . "\n";
+}
 
 echo "Done\n";
 ?>
@@ -26,7 +30,5 @@ string(36) "6;F]T('9E<GD@<V]P:&ES=&EC871E9```
 `
 "
 string(22) "not very sophisticated"
-
-Warning: convert_uudecode(): The given parameter is not a valid uuencoded string in %s on line %d
-bool(false)
+The given parameter is not a valid uuencoded string
 Done