refactor($dead-code): remove dead code

#1238
fix(identify.js): normalized blob name not always being logged

#1238
fix($sendOriginal): non-image ignored w/ scaling.sendOriginal: false

In addition to ensuring that non-images are not ignored when scaling is turned on
and the sendOriginal option is false, I also needed to adjust other logic that was
unintentionally dependant on this faulty logic.

fixes #1238
chore($release): prepare for 5.0.3 release
[skip ci]
#1238
Merge branch 'hotfix/non-image-ignored-with-scaling'