instruct RDoc to only parse Ruby files under lib [Fixes #9779]
1. Change from each to each_value since we did not use key
2. drop assignment of value to sum in test
Merge pull request #9782 from vipulnsward/change_from_each_to_each_key_habtm

Change from each to each_value;drop assignment in habtm
Revert "instruct RDoc to only parse Ruby files under lib [Fixes #9779]"

This reverts commit c24528fbc94dea9946a563be3bed9559583bdc57.
Fix failing tests related to where values change to strings

Introduced in 5dc2e3531babcbdc165884d1a47cbcd13455522d.
change from blank? to empty? on obvious string values  to save extra method calls
Merge pull request #9784 from vipulnsward/change_from_blank_to_empty_on_string

Change from blank? to empty? on obvious string values  to save extra calls
Revert "Merge pull request #9784 from vipulnsward/change_from_blank_to_empty_on_string"

This reverts commit 9c4c05fc82e997b722dec4068c3aa27eaee69eb8, reversing
changes made to 4620bdcefd0c88905a005f191496df887877b8f3.

Reason: They're not completely interchangeable, since blank? will also
check for strings containing spaces.