doctrine:cache:clear-* and doctrine:mongodb:cache:clear-* have inconsistent behaviors

[edhelas]

Bug Report

doctrine/mongodb-odm 1.2.5
doctrine/orm v2.6.2

Summary

When calling the following doctrine commands

• doctrine:cache:clear-metadata
• doctrine:cache:clear-query
• doctrine:cache:clear-result

I'm expecting the same behavior as

• doctrine:mongodb:cache:clear-metadata

Current behavior

Those commands are actually failing if no cache was cleared

if ( ! $result) {
  $ui->error($message);

  return 1;
}

How to reproduce

Call those commands with an empty cache

Expected behavior

The behavior from MongoDB seems more natural. Those commands shoudn't return an error if no cache was cleared but simply display an information message.
When wrapping those commands in composer there is no proper way to make them fail silently

"cache:doctrine": [
    "bin/console doctrine:mongodb:cache:clear-metadata --ansi",
    "bin/console doctrine:cache:clear-metadata --ansi",
    // Fail there 
    "bin/console doctrine:cache:clear-query --ansi",
    "bin/console doctrine:cache:clear-result --ansi"
],