Bug XF\Extension::removeClassExtensions doesn't check existence

[pegasus]

In XF\Extension::removeClassExtensions, we have:
Code:

foreach ($this->classExtensions[$class] AS $subclass)
{
   unset($this->inverseExtensionMap[$subclass]);
}

However, this does not check that the key $this->classExtensions[$class] exists before looping it, which throws an invalid key error and a foreach error. Since XF\Extension also provides no getter for $this->classExtensions, there is no easy way for an add-on to know whether this key exists if they need to call...

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