[Fix] nvm ls, nvm alias, nvm install: error when an LTS name is invalid

install.sh

@@ -428,10 +428,7 @@ nvm_do_install() {
   COMPLETION_STR='[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion\n'
   BASH_OR_ZSH=false
 
-  if [ "${PROFILE-}" = '/dev/null' ] ; then
+  if [ -z "${NVM_PROFILE-}" ] ; then
-    # the user has specifically requested NOT to have nvm touch their profile
-    echo
-  elif [ -z "${NVM_PROFILE-}" ] ; then
     local TRIED_PROFILE
     if [ -n "${PROFILE}" ]; then
       TRIED_PROFILE="${NVM_PROFILE} (as defined in \$PROFILE), "