Prevent "undefined index" notice if $parts array is empty in Index\Index#removeIndexedDefinition #750
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If `$level` reaches 0, `array_slice($parts, 0, $level)` returns an empty array. This will issue a "undefined index notice" in the next recursion on `$part = $parts[$level]`. This notice gets transformed to an ErrorException which will cancel further analysis.
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If
$levelreaches 0 with only one more element in the$partsarray, the next call toarray_slice($parts, 0, $level)will return an empty array. This will trigger a "undefined index" notice in the next recursion on$part = $parts[$level]. This notice gets promoted to an ErrorException in the error-handler (if the local php.ini is configured to report notices) which will cancel further processing.Fixes #695