Warn instead of error if ecm_install_icons finds no icons.

Review Request #125931 - Created Nov. 3, 2015 and submitted

Information
Alex Merry
extra-cmake-modules
master
Reviewers
extracmakemodules
The V1 syntax of ecm_install_icons searched for icons by globbing files
with a particular naming pattern. If there were no such icons, this used
to do nothing, but silently. Commit fb7b8eea7d accidentally made this an
error. More sensible would be to make it a warning.

BUG: 354610

Extended unit test, which passes, and ksirk now successfully configures.

David Faure
Alex Merry
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit 21629f651a6a5d9d977be03fd9f98417c4fa27ae by Alex Merry to branch master.
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