add null check to gender

.gitignore

@@ -23,3 +23,5 @@ yarn-debug.log*
 yarn-error.log*
 
 .firebase
+
+src/components/testData.json

src/App.js

@@ -59,10 +59,10 @@ function App() {
         const patient = document.data();
         patients.push(patient);
         const { gender } = patient;
-        if (gender.toLowerCase() === 'male') {
+        if (gender?.toLowerCase() === 'male') {
           maleCount++;
         }
-        if (gender.toLowerCase() === 'female') {
+        if (gender?.toLowerCase() === 'female') {
           femaleCount++;
         }
       });
@@ -139,12 +139,14 @@ function App() {
           <Card title={"Disease"} counter={diseases} backgroundColor={'rgb(249, 195, 195)'} />
         </div>
 
-        <div className='last-update'>
-          Updated At: {Date(lastUpdate).toLocaleString()}
-        </div>
+        <div className='footer'>
+          <div className='last-update'>
+            Updated At: {Date(lastUpdate).toLocaleString()}
+          </div>
 
-        <div className='developer'>
-          Developed by <img className="dev-logo" src={require('./smi-logo-120x120.webp')} /> ShanMukha
+          <div className='developer'>
+            Developed by <img className="dev-logo" src={require('./smi-logo-120x120.webp')} /> ShanMukha
+          </div>
         </div>
       </div>
     </div>