Fixes blank? NoMethod found error when using latest version of 'aws' by appoxy#4

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NeMO84 wants to merge 2 commits intoappoxy:masterfrom

NeMO84:master

Commits on Apr 19, 2011

Added fix for .blank? checks on objects which used to be set via another project. This approach doesn't allow other projects to use it as a self contained gem.
NeMO84
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Added change to allow blank check to use an inherited blank method check if available.
NeMO84
committed