[java] Making sure browser path is not null

Closes #12450

Author: diemol

java/src/org/openqa/selenium/chrome/ChromeDriver.java

@@ -98,7 +98,9 @@ private static ChromeDriverCommandExecutor generateExecutor(
     if (service.getExecutable() == null) {
       Result result = DriverFinder.getPath(service, options);
       service.setExecutable(result.getDriverPath());
-      options.setBinary(result.getBrowserPath());
+      if (result.getBrowserPath() != null) {
+        options.setBinary(result.getBrowserPath());
+      }
     }
     return new ChromeDriverCommandExecutor(service, clientConfig);
   }

java/src/org/openqa/selenium/edge/EdgeDriver.java

@@ -70,7 +70,9 @@ private static EdgeDriverCommandExecutor generateExecutor(
     if (service.getExecutable() == null) {
       Result result = DriverFinder.getPath(service, options);
       service.setExecutable(result.getDriverPath());
-      options.setBinary(result.getBrowserPath());
+      if (result.getBrowserPath() != null) {
+        options.setBinary(result.getBrowserPath());
+      }
     }
     return new EdgeDriverCommandExecutor(service, clientConfig);
   }

java/src/org/openqa/selenium/firefox/FirefoxDriver.java

@@ -140,7 +140,9 @@ private static FirefoxDriverCommandExecutor generateExecutor(
     if (service.getExecutable() == null) {
       Result result = DriverFinder.getPath(service, options);
       service.setExecutable(result.getDriverPath());
-      options.setBinary(result.getBrowserPath());
+      if (result.getBrowserPath() != null) {
+        options.setBinary(result.getBrowserPath());
+      }
     }
     return new FirefoxDriverCommandExecutor(service, clientConfig);
   }