use empty instead of size() == 0

Change-Id: I08b1e73323a15dd977daba98946e7deec3967503
Reviewed-on: https://gerrit.libreoffice.org/40575
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
diff --git a/fpicker/source/office/RemoteFilesDialog.cxx b/fpicker/source/office/RemoteFilesDialog.cxx
index fd9a29a..ca37b71 100644
--- a/fpicker/source/office/RemoteFilesDialog.cxx
+++ b/fpicker/source/office/RemoteFilesDialog.cxx
@@ -526,7 +526,7 @@ int RemoteFilesDialog::GetSelectedServicePos()
    int nPos = 0;
    int i = -1;

    if( m_aServices.size() == 0 )
    if( m_aServices.empty() )
        return -1;

    while( nPos < ( int )m_aServices.size() )