Philippe 31/03/2023: bugfix: profile_mesonh.ihm: correct problem if conf_* file does not exist

Was causing problems with CI on Gitlab (reported by Cedric Gazoppi)

conf/profile_mesonh.ihm

 #!/bin/bash
-#MNH_LIC Copyright 1994-2021 CNRS, Meteo-France and Universite Paul Sabatier
+#MNH_LIC Copyright 1994-2023 CNRS, Meteo-France and Universite Paul Sabatier
 #MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 #MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 #MNH_LIC for details. version 1.
@@ -171,8 +171,7 @@ export VARTTY=\`tty\`
 #
 # Variable depending on \$ARCH 
 #
-[ -f \${SRC_MESONH}/conf/conf_\${ARCH} ] && . \${SRC_MESONH}/conf/conf_\${ARCH}
-
+[ ! -f \${SRC_MESONH}/conf/conf_\${ARCH} ] || . \${SRC_MESONH}/conf/conf_\${ARCH}
 #
 # Optional Environnement variable/Module  Env
 #