Refactors -[tableView:cellForRowAtIndexPath:] (#3326)

Fixes static analyzer issue complaining  -[tableView:cellForRowAtIndexPath:] returns nil.

ChartsDemo/Objective-C/DemoBaseViewController.m

@@ -170,7 +170,8 @@ - (IBAction)optionsButtonTapped:(id)sender
     _optionsTableView.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.9f];
     _optionsTableView.delegate = self;
     _optionsTableView.dataSource = self;
-
+    [_optionsTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
+
     _optionsTableView.translatesAutoresizingMaskIntoConstraints = NO;
 
     NSMutableArray *constraints = [[NSMutableArray alloc] init];
@@ -224,23 +225,14 @@ - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPa
 
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
-    if (tableView == _optionsTableView)
-    {
-        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
-        if (!cell)
-        {
-            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
-            cell.backgroundView = nil;
-            cell.backgroundColor = UIColor.clearColor;
-            cell.textLabel.textColor = UIColor.whiteColor;
-        }
-
-        cell.textLabel.text = self.options[indexPath.row][@"label"];
-
-        return cell;
-    }
-
-    return nil;
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
+    cell.backgroundView = nil;
+    cell.backgroundColor = UIColor.clearColor;
+    cell.textLabel.textColor = UIColor.whiteColor;
+
+    cell.textLabel.text = self.options[indexPath.row][@"label"];
+
+    return cell;
 }
 
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath