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When we read the MUC configuration, a file which exists but is empty will not error, but will cause all configuration to be empty. We already perform an {{is_array()}} check on the {{$configuration}} variable, but the default value for {{$configuration}} is an empty array. In the case where the file exists, but is empty, no errors occur when the file is loaded, and the initial {{$configuration}} value is not overwritten, leading to the file being replaced with an empty copy.b26a5e5e
