Avoid throwing an exception in RemoteWebDriver.toString()

There's no guarantee we'll know the remote platform and
be able to construct a `Platform` instance from it.

Author: shs96c

java/client/src/org/openqa/selenium/remote/RemoteWebDriver.java

@@ -1101,7 +1101,21 @@ public String toString() {
     if (caps == null) {
       return super.toString();
     }
-    return String.format("%s: %s on %s (%s)", getClass().getSimpleName(),
-        caps.getBrowserName(), caps.getPlatform(), getSessionId());
+
+    // w3c name first
+    Object platform = caps.getCapability("platformName");
+    if (!(platform instanceof String)) {
+      platform = caps.getCapability("platform");
+    }
+    if (platform == null) {
+      platform = "unknown";
+    }
+
+    return String.format(
+        "%s: %s on %s (%s)",
+        getClass().getSimpleName(),
+        caps.getBrowserName(),
+        platform,
+        getSessionId());
   }
 }