skip fillter keyword resets for analytics

src/pages/photogallery.js

@@ -30,6 +30,7 @@ const GalleryPage = ({ data }) => {
 
   const setKeyword = React.useCallback(
     (newKeyword) => {
+      if (newKeyword) {
         try {
           window.plausible("Filter Keyword", {
             props: { keyword: newKeyword },
@@ -37,6 +38,7 @@ const GalleryPage = ({ data }) => {
         } catch (e) {
           // do nothing
         }
+      }
       _setKeyword(newKeyword);
       window.history.replaceState(
         null,