Merge branch '312-modulecmd-print-help-if-modulecmd-is-called-without-arg' into 'master'

Resolve "modulecmd: print help if modulecmd is called without arg"

Closes #312

See merge request Pmodules/src!291

Pmodules/modulecmd.bash.in

@@ -3507,6 +3507,7 @@ subcommand_initclear() {
 # parse arguments
 #
 
+(( $# > 0 )) || print_help 'help'
 # first argument must be a shell!
 case "$1" in
 	sh | bash | zsh )