[4/3] comctl32: Fix broken detection of non-empty string

[Alexander Dorofeyev]

MultiByteToWideChar returns 1 for an empty string, so this was failing to 
properly detect empty string, as a result further steps were not taken. Should 
fix tooltips in RAdmin.
---
  dlls/comctl32/toolbar.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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