Improve exception when executing tests with test-server running but no browsers connected

[leggetter]

At the moment you get the following error:

sdk/brjs test apps/brjs-todo/todo-bladeset/blades/todoinput/
BladeRunner version: 0.0-188-gddbea09-DEV, built: 25 October 2013 20:09 BST

Server already running, not bothering to start a new instance...


Testing tests (UTs):
WARN: java.lang.RuntimeException: No browsers available, yet actions requested. If running against a persistent server please capture browsers. Otherwise, ensure that browsers are defined.
Unexpected Runner Condition: No browsers available, yet actions requested. If running against a persistent server please capture browsers. Otherwise, ensure that browsers are defined.
WARN:   at com.google.jstestdriver.browser.BrowserActionExecutorAction.run(BrowserActionExecutorAction.java:89)
 Use --runnerMode DEBUG for more information.
WARN:   at com.google.jstestdriver.ActionRunner.runActions(ActionRunner.java:81)
WARN:   at com.google.jstestdriver.JsTestDriver.runConfigurationWithFlags(JsTestDriver.java:263)
WARN:   at com.google.jstestdriver.JsTestDriver.runConfiguration(JsTestDriver.java:211)
WARN:   at com.google.jstestdriver.JsTestDriver.main(JsTestDriver.java:144)
Tests Failed.


- Time Taken: 2secs
Error:
  Test failure or error while running tests.

Stack Trace:
org.bladerunnerjs.model.exception.command.CommandOperationException: Test failure or error while running tests.
    at com.caplin.cutlass.command.test.testrunner.TestRunnerController.run(TestRunnerController.java:142)
    at com.caplin.cutlass.command.test.TestCommand.doCommand(TestCommand.java:51)
    at org.bladerunnerjs.model.utility.CommandRunner.run(CommandRunner.java:21)
    at org.bladerunnerjs.model.BRJS.runCommand(BRJS.java:277)
    at org.bladerunnerjs.model.utility.UserCommandRunner.run(UserCommandRunner.java:25)
    at org.bladerunnerjs.model.BRJS.runUserCommand(BRJS.java:282)
    at org.bladerunnerjs.CommandRunner.run(CommandRunner.java:77)
    at org.bladerunnerjs.CommandRunner.main(CommandRunner.java:39)

org.bladerunnerjs.model.exception.command.CommandOperationException: Test failure or error while running tests.
    at com.caplin.cutlass.command.test.testrunner.TestRunnerController.run(TestRunnerController.java:142)
    at com.caplin.cutlass.command.test.TestCommand.doCommand(TestCommand.java:51)
    at org.bladerunnerjs.model.utility.CommandRunner.run(CommandRunner.java:21)
    at org.bladerunnerjs.model.BRJS.runCommand(BRJS.java:277)
    at org.bladerunnerjs.model.utility.UserCommandRunner.run(UserCommandRunner.java:25)
    at org.bladerunnerjs.model.BRJS.runUserCommand(BRJS.java:282)
    at org.bladerunnerjs.CommandRunner.run(CommandRunner.java:77)
    at org.bladerunnerjs.CommandRunner.main(CommandRunner.java:39)

Can we provide more information in the error?