TerminalBuilder throws NPE on windows with missing jna/jansi

[jvalkeal]

Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because "this.jna" is null
at org.jline.terminal.TerminalBuilder.doBuild(TerminalBuilder.java:443) ~[jline-3.24.1.jar!/:na]
at org.jline.terminal.TerminalBuilder.build(TerminalBuilder.java:362) ~[jline-3.24.1.jar!/:na]

There should be null check before throwing IllegalStateException as jna and jansi variables are Booleans.

jline3/terminal/src/main/java/org/jline/terminal/TerminalBuilder.java

Lines 443 to 446 in c046200

	if (terminal == null && OSUtils.IS_WINDOWS && !jna && !jansi && !jni && (dumb == null || !dumb)) {
	throw new IllegalStateException("Unable to create a system terminal. On windows, either "
	+ "JNA or JANSI library is required. Make sure to add one of those in the classpath.");
	}

[gnodet]

See https://issues.apache.org/jira/browse/MNG-8022