EmptyStackException when no args are passed to object annotated with Parameters

[remkop]

picocli.CommandLine$ParameterException: EmptyStackException: null while processing option[0] '?'.
	at picocli.CommandLine$ParameterException.create(CommandLine.java:3147)
	at picocli.CommandLine$ParameterException.access$900(CommandLine.java:3134)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:1034)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:1019)
	at picocli.CommandLine.parse(CommandLine.java:191)
	at picocli.CommandLine.parse(CommandLine.java:176)
	at picocli.CommandLine$parse.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
EmptyStackException: null while processing option[0] '?'.
	at jp.co.smbcnikko.refdata.LoadVolumeCurves.run(LoadVolumeCurves.groovy:19)
	at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:263)
	at groovy.lang.GroovyShell.run(GroovyShell.java:518)
	at groovy.lang.GroovyShell.run(GroovyShell.java:507)
	at groovy.ui.GroovyMain.processOnce(GroovyMain.java:653)
	at groovy.ui.GroovyMain.run(GroovyMain.java:384)
	at groovy.ui.GroovyMain.process(GroovyMain.java:370)
	at groovy.ui.GroovyMain.processArgs(GroovyMain.java:129)
	at groovy.ui.GroovyMain.main(GroovyMain.java:109)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:109)
	at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:131)
Caused by: java.util.EmptyStackException
	at java.util.Stack.peek(Stack.java:102)
	at java.util.Stack.pop(Stack.java:84)
	at picocli.CommandLine$Interpreter.processPositionalParameters0(CommandLine.java:1119)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:1027)
	... 22 more

[remkop]

processPostionalParameters0 needs this fix (line 1119)

                for (int i = 0; i < indexRange.min && !argsCopy.isEmpty(); i++) { argsCopy.pop(); }