Revert "ExtendedDefaultParser should not add empty arguments"

This reverts commit af7be31.

Relates #764

Author: jvalkeal

spring-shell-core/src/main/java/org/springframework/shell/jline/ExtendedDefaultParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2023 the original author or authors.
+ * Copyright 2017-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -126,12 +126,10 @@ else if (!isEscapeChar(line, i)) {
 		}
 
 		if (current.length() > 0 || (line != null && cursor == line.length())) {
-			if (current.length() > 0) {
-				words.add(current.toString());
-			}
+			words.add(current.toString());
 		}
 
-		if (line != null && cursor == line.length() && words.size() > 0) {
+		if (line != null && cursor == line.length()) {
 			wordIndex = words.size() - 1;
 			wordCursor = words.get(words.size() - 1).length();
 		}