Fix NullPointerException in LoggerPreprocessor

This handles the case of loggerName being null when running scripts that contain a Logger parameter.

Author: imagejan

src/main/java/org/scijava/module/process/LoggerPreprocessor.java

@@ -66,7 +66,7 @@ public void process(final Module module) {
 		if (loggerInput == null || !loggerInput.isAutoFill()) return;
 
 		String loggerName = loggerInput.getLabel();
-		if(loggerName.isEmpty())
+		if(loggerName == null || loggerName.isEmpty())
 			loggerName = module.getDelegateObject().getClass().getSimpleName();
 		Logger logger = logService.subLogger(loggerName);