fix: enable nullglob to avoid glob expansion errors when no node versions installed

Fixes nvm-sh#3727

When no node versions are installed, nvm ls produces errors like:
`find: /path/.nvm/versions/node/*: No such file or directory`

This happens because bash expands `*` literally when nullglob is not
set and the directory is empty.

Solution:
- Temporarily enable nullglob before the find command
- Restore nullglob to its previous state after the command completes
- This allows the original find syntax to work correctly with empty directories

Author: Andrew Leng

nvm.sh

@@ -1532,6 +1532,16 @@ nvm_ls() {
       SEARCH_PATTERN="$(nvm_echo "${PATTERN}" | command sed 's#\.#\\\.#g;')"
     fi
     if [ -n "${NVM_DIRS_TO_SEARCH1}${NVM_DIRS_TO_SEARCH2}${NVM_DIRS_TO_SEARCH3}" ]; then
+      # Enable nullglob to avoid errors when directories are empty
+      # See: https://github.com/nvm-sh/nvm/issues/3727
+      local NVM_NULLGLOB_WAS_SET
+      NVM_NULLGLOB_WAS_SET=false
+      if nvm_has "shopt"; then
+        if shopt -q nullglob; then
+          NVM_NULLGLOB_WAS_SET=true
+        fi
+        shopt -s nullglob
+      fi
       VERSIONS="$(command find "${NVM_DIRS_TO_SEARCH1}"/* "${NVM_DIRS_TO_SEARCH2}"/* "${NVM_DIRS_TO_SEARCH3}"/* -name . -o -type d -prune -o -path "${PATTERN}*" \
         | command sed -e "
             s#${NVM_VERSION_DIR_IOJS}/#versions/${NVM_IOJS_PREFIX}/#;
@@ -1547,6 +1557,10 @@ nvm_ls() {
         | command sed -e 's#\(.*\)\.\([^\.]\{1,\}\)$#\2-\1#;' \
                       -e "s#^${NVM_NODE_PREFIX}-##;" \
       )"
+      # Restore nullglob to its previous state
+      if nvm_has "shopt" && [ "${NVM_NULLGLOB_WAS_SET}" = 'false' ]; then
+        shopt -u nullglob
+      fi
     fi
   fi