if (PL_DHASH_ENTRY_IS_FREE(entry))
if (!entry || PL_DHASH_ENTRY_IS_FREE(entry))
LookupLowercasedKeyword(const nsACString& aLowercasedKeyword,                         PLDHashTable& aTable){    const nsPromiseFlatCString& flatString = PromiseFlatCString(aLowercasedKeyword);       nameTableEntry *entry =      NS_STATIC_CAST(nameTableEntry*,                     PL_DHashTableOperate(&aTable, flatString.get(), PL_DHASH_LOOKUP));    if (PL_DHASH_ENTRY_IS_FREE(entry))      return nsStaticCaseInsensitiveNameTable::NOT_FOUND;        return entry->mIndex;}  