Fix detection of rdbfsmua modulefile

Build script was checking for the existance of a modulefile for rdbfmsua,
but did not include the '.lua' that exists in the filename. Changed the
detection to instead try to load the file and detect when there is an
error.

ush/build.sh

@@ -35,20 +35,21 @@ mkdir -p "${BUILD_DIR}" && cd "${BUILD_DIR}"
 
 # Configure, build, install
 set -x
+# shellcheck disable=SC2086
 cmake ${CMAKE_OPTS} "${DIR_ROOT}"
 make -j "${BUILD_JOBS:-8}" VERBOSE="${BUILD_VERBOSE:-}"
 make install
 set +x
 
 # Build rdbfmsua.x with makefile separately due to GEMPAK issues in cmake
 # Load modules
-if [[ -f "${DIR_ROOT}/modulefiles/rdbfmsua_${MACHINE_ID}.${COMPILER}" ]]; then
-  source "${DIR_ROOT}/ush/module-setup.sh"
-  module use "${DIR_ROOT}/modulefiles"
-  module load "rdbfmsua_${MACHINE_ID}.${COMPILER}"
+source "${DIR_ROOT}/ush/module-setup.sh"
+module use "${DIR_ROOT}/modulefiles"
+if module load "rdbfmsua_${MACHINE_ID}.${COMPILER}" &> /dev/null; then
   module list
 else
-  echo "No modulefile for 'rdbfmsua' on '${MACHINE_ID}'. Skip building 'rdbfmsua.x'"
+  echo "WARNING: Unable to load modelfile for 'rdbfmsua' on '${MACHINE_ID}' (does it exist?)."
+  echo "  Skipping building 'rdbfmsua.x'"
   exit 0
 fi