scripts/cli in rvm-0.1.0 vs scripts/cli in rvm-0.1.1

@@ -66,11 +66,16 @@
           rvm_ruby_string=$(echo $rvm_gem_set_name | sed 's/\(.*\)%.*/\1/')
           rvm_gem_set_name=$(echo $rvm_gem_set_name | sed 's/.*%\(.*\)/\1/')
           if [[ "$rvm_ruby_string" != "$rvm_gem_set_name" ]] ; then export rvm_ruby_string ; fi
           if [[ ! -z "$rvm_gem_set_name" ]] ; then export rvm_gem_set_name ; fi
         else
-          rvm_gem_set_name="$1" ; shift
-          export rvm_use_flag=1 # Default is to use the (named) gem set.
+          if [[ -z "$1" ]] ; then
+            rvm_action="error"
+            rvm_error_message="'gems' must be followed by a gems(et) action, see http://rvm.beginrescueend.com/gemsets/#managing for details."
+          else
+            rvm_gem_set_name="$1" ; shift
+            export rvm_use_flag=1 # Default is to use the (named) gem set.
+          fi
         fi
       ;;
 
       gemdir)
         rvm_action=$rvm_token