Make requestDriver more resilient to errors (#46)

If the async request performed in `requestDriver.makeDriver()` fails, it would call the `callback` function with empty parameters but then continue the execution which can lead to the following error and crash of Fredy:
```
Error while trying to scrape data. Received error: Request failed with status code 504
/fredy/lib/services/requestDriver.js:25
    if (typeof result.data === 'object' && url.toLowerCase().indexOf('scrapingant') !== -1) {
                      ^

TypeError: Cannot read properties of undefined (reading 'data')
    at driver (/fredy/lib/services/requestDriver.js:25:23)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
```

lib/services/requestDriver.js

@@ -7,20 +7,15 @@ function makeDriver(headers = {}) {
   let cookies = '';
 
   return async function driver(context, callback) {
-    const url = context.url;
-    let result;
     try {
-      result = await axios({
+      const url = context.url;
+      const result = await axios({
         url,
         headers: {
           ...headers,
           Cookie: cookies,
         },
       });
-    } catch (exception) {
-      console.error(`Error while trying to scrape data. Received error: ${exception.message}`);
-      callback(null, []);
-    }
 
       if (typeof result.data === 'object' && url.toLowerCase().indexOf('scrapingant') !== -1) {
         //assume we have gotten a response from scrapingAnt
@@ -31,6 +26,10 @@ function makeDriver(headers = {}) {
       } else {
         callback(null, result.data);
       }
+    } catch (exception) {
+      console.error(`Error while trying to scrape data. Received error: ${exception.message}`);
+      callback(null, []);
+    }
   };
 }