Remove warning when guide functions are used in identity scales#3131

Merged

clauswilke merged 2 commits intotidyverse:masterfrom

wilkelab:issue-3127-identity-scale-guide

Feb 12, 2019

Commits on Feb 11, 2019

properly check for presence/absence of guide. Closes #3127.
clauswilke
committed

Commits on Feb 12, 2019

use `identical()` instead of `isTRUE()`.
clauswilke
committed