Tweaked Java and C++ code and comment slightly.

cpp/QrSegment.cpp

@@ -115,7 +115,7 @@ QrSegment QrSegment::makeAlphanumeric(const char *text) {
 vector<QrSegment> QrSegment::makeSegments(const char *text) {
 	// Select the most efficient segment encoding automatically
 	vector<QrSegment> result;
-	if (*text == '\0');  // Leave the vector empty
+	if (*text == '\0');  // Leave result empty
 	else if (isNumeric(text))
 		result.push_back(makeNumeric(text));
 	else if (isAlphanumeric(text))

java/io/nayuki/qrcodegen/QrSegment.java

@@ -118,8 +118,7 @@ public final class QrSegment {
 		
 		// Select the most efficient segment encoding automatically
 		List<QrSegment> result = new ArrayList<>();
-		if (text.equals(""))
-			return result;
+		if (text.equals(""));  // Leave result empty
 		else if (NUMERIC_REGEX.matcher(text).matches())
 			result.add(makeNumeric(text));
 		else if (ALPHANUMERIC_REGEX.matcher(text).matches())