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fix($parse): return 'undefined' if a middle key's value is null #5480
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Prior to this fix, $parse/$eval would return 'null' if a middle key in an expression's value is null, when it should be expected to be undefined.
This patch tries to remedy this by returning undefined for middle values in expressions, when fetching a child of that null value.
For example:
Fixes #2249
Fixes #5442