Revert "ExtendedDefaultParser should not add empty arguments"

This reverts commit c1c9f5e.

Relates #765

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.
@@ -125,26 +125,23 @@ else if (!isEscapeChar(line, i)) {
 			}
 		}
 
-		if (current.length() > 0 || (line != null && cursor == line.length())) {
-			if (current.length() > 0) {
-				words.add(current.toString());
-			}
+		if (current.length() > 0 || cursor == line.length()) {
+			words.add(current.toString());
 		}
 
-		if (line != null && cursor == line.length() && words.size() > 0) {
+		if (cursor == line.length()) {
 			wordIndex = words.size() - 1;
 			wordCursor = words.get(words.size() - 1).length();
 		}
 
-		if (eofOnEscapedNewLine && (line != null && isEscapeChar(line, line.length() - 1))) {
+		if (eofOnEscapedNewLine && isEscapeChar(line, line.length() - 1)) {
 			throw new EOFError(-1, -1, "Escaped new line", "newline");
 		}
 		if (eofOnUnclosedQuote && quoteStart >= 0 && context != ParseContext.COMPLETE) {
-			throw new EOFError(-1, -1, "Missing closing quote",
-					(line != null && line.charAt(quoteStart) == '\'') ? "quote" : "dquote");
+			throw new EOFError(-1, -1, "Missing closing quote", line.charAt(quoteStart) == '\'' ? "quote" : "dquote");
 		}
 
-		String openingQuote = (quoteStart >= 0 && line != null) ? line.substring(quoteStart, quoteStart + 1) : null;
+		String openingQuote = quoteStart >= 0 ? line.substring(quoteStart, quoteStart + 1) : null;
 		return wrap(new ExtendedArgumentList(line, words, wordIndex, wordCursor, cursor, openingQuote));
 	}