fix(app): #7014 where "quasar clean" can create an empty "dist" folder (#7016)
fix(app): #7014 where "quasar clean" can create an empty "dist" folder (#7016)

* Only call emptyDirSync on "dist" if it exists

As a side-effect, emptyDirSync will create the folder if it does not exist.  Small annoyance for users who are not using the default "dist" directory for build artifacts.

* Update artifacts.js

Co-authored-by: Razvan Stoenescu <5ced39d27860b435bebb748c5dedb4e40f3b0e82@gmail.com>
pdanpdan/quasar,rstoenescu/quasar-framework,pdanpdan/quasar,quasarframework/quasar,rstoenescu/quasar-framework,quasarframework/quasar,quasarframework/quasar,fsgiudice/quasar,fsgiudice/quasar,fsgiudice/quasar,rstoenescu/quasar-framework,quasarframework/quasar,pdanpdan/quasar,pdanpdan/quasar