Fix javax/swing/text/ParagraphView/6364882/bug6364882.java failures

javax/swing/text/ParagraphView/6364882/bug6364882.java was observed failing on our non-GUI platforms.

The OS is tlinux which is developed and widely used in our company.

STDERR:
java.lang.reflect.InvocationTargetException
        at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1371)
        at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1346)
        at java.desktop/javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1480)
        at bug6364882.main(bug6364882.java:83)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.AssertionError: paragraph doesn't have 6 rows of text
        at bug6364882.checkJustification(bug6364882.java:137)
        at bug6364882.lambda$main$0(bug6364882.java:87)
        at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:308)
        at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
        at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
        at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

This test passed on our GUI platforms but failed without GUI.