Fix for 1-letter completion

Completion would sometimes not show if the prompt was only one letter long and identical to the previous completion

javascript/tagAutocomplete.js

@@ -576,6 +576,8 @@ async function autocomplete(textArea, prompt, fixedTag = null) {
     // Guard for empty prompt
     if (prompt.length === 0) {
         hideResults(textArea);
+        previousTags = [];
+        tagword = "";
         return;
     }
 
@@ -590,6 +592,14 @@ async function autocomplete(textArea, prompt, fixedTag = null) {
                 .concat(weightedTags);
         }
 
+        // Guard for no tags
+        if (!tags || tags.length === 0) {
+            previousTags = [];
+            tagword = "";
+            hideResults(textArea);
+            return;
+        }
+
         let tagCountChange = tags.length - previousTags.length;
         let diff = difference(tags, previousTags);
         previousTags = tags;