fix(smartfuzzy): handle empty search strings safely and update tests for stricter TypeScript compatibility

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartfuzzy',
-  version: '1.1.10',
+  version: '2.0.1',
   description: 'A library for fuzzy matching strings against word dictionaries or arrays, with support for object and article searching.'
 }

ts/smartfuzzy.classes.smartfuzzy.ts

@@ -118,6 +118,10 @@ export class Smartfuzzy {
       return null; // Return null for empty dictionary instead of throwing error
     }
 
+    if (stringArg.length === 0) {
+      return null;
+    }
+
     const fuseDictionary: { name: string }[] = [];
     for (const wordArg of this.dictionary) {
       fuseDictionary.push({
@@ -135,7 +139,7 @@ export class Smartfuzzy {
     };
     const fuse = new plugins.fuseJs(fuseDictionary, fuseOptions);
     const fuzzyResult = fuse.search(stringArg);
-    let closestMatch: string = null;
+    let closestMatch: string | null = null;
     if (fuzzyResult.length > 0) {
       closestMatch = fuzzyResult[0].item.name;
     }