TT#68016 selenium: more improvements to get_text_safe()

FirefoxExtensions.pm:
- exit function when path is not specified
- is now able to use css and other paths as well. defaults to xpath

Change-Id: I9c47e1ee9ec502c97af25099c09ef6d7a7f007eb

t/lib/Selenium/Remote/Driver/FirefoxExtensions.pm

@@ -126,9 +126,11 @@ sub move_and_click {
 }
 
 sub get_text_safe {
-    my ($self, $path) = @_;
+    my ($self, $path, $type) = @_;
+    return unless $path;
+    $type //= "xpath";
     try {
-        my $element = $self->find_element($path);
+        my $element = $self->find_element($path, $type);
         return $element->get_text();
     } catch {
         return 'Element not found';