Issue #5472 - CRITICAL while using Move tool with arrow keys

In gimp_edit_selection_tool_translate(), perform the active-item
checks even when the effective translation offset is 0, and only
bail afterwards.  This avoids erroneously calling
gimp_tool_message_literal() with a NULL message in this case.
12 jobs for master in 30 minutes and 30 seconds (queued for 1 second)
Status Job ID Name Coverage
  Prepare
passed #831880
build-image

00:02:08

passed #831882
build-image-win32

00:01:50

passed #831881
build-image-win64

00:02:20

 
  Dependencies
passed #831883
deps-debian/testing

00:02:16

passed #831885
deps-win32

00:12:13

passed #831884
deps-win64

00:10:49

 
  Gimp
passed #831886
gimp-debian/testing-autotools

00:21:35

passed #831888
gimp-debian/testing-clang

00:19:52

passed #831887
gimp-debian/testing-meson

00:04:34

passed #831890
gimp-win32

00:16:24

passed #831889
gimp-win64

00:12:30

 
  Analysis
passed #831891
cppcheck

00:02:24