create workspace with invalid bundle url,shouldn't finish

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.2 M1
• Fix Version/s: 3.2 GA1
• Component/s: Liferay Workspace Support
• Labels: None
• Liferay Contributor's Agreement:
  Accept

steps:
1.open new liferay workspace wizard
2.prepare project name
3.select "Download Liferay bundle"
4.input invalid bundle url(for example:"http://"、"https://"、"ftp://")
5.click finish button
Actual results：
1.finish button can be finish
2.workspace can be created
3.wizard is still exists
4.appear error pop-up
5.error log：

java.lang.NullPointerException
at com.liferay.ide.project.core.workspace.NewLiferayWorkspaceOpMethods.execute(NewLiferayWorkspaceOpMethods.java:77)
at com.liferay.ide.project.core.workspace.NewLiferayWorkspaceOp$Impl.execute(Unknown Source)
at org.eclipse.sapphire.ui.forms.swt.SapphireWizard.performFinish(SapphireWizard.java:398)
at org.eclipse.sapphire.ui.forms.swt.SapphireWizard$3.run(SapphireWizard.java:362)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)