[BUGFIX beta] Guard against null attrs in getRoot hook.
#12600
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In certain circumstances, `attrs` can be null (that is the default value). This guards against a `key in null` error.
rwjblue
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Nov 13, 2015
[BUGFIX beta] Guard against `null` `attrs` in getRoot hook.
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In certain circumstances,
attrscan be null (that is the default value). This guards against akey in nullerror.