Ensure send keys action checks input

Author: shs96c

java/client/src/org/openqa/selenium/interactions/SendKeysAction.java

@@ -24,6 +24,7 @@
 import org.openqa.selenium.interactions.internal.Locatable;
 
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Sending a sequence of keys to an element.
@@ -40,6 +41,10 @@ public SendKeysAction(
       Locatable locationProvider,
       CharSequence... keysToSend) {
     super(keyboard, mouse, locationProvider);
+
+    if (keysToSend == null) {
+      throw new IllegalArgumentException("Keys should be a not null CharSequence");
+    }
     this.keysToSend = keysToSend;
   }