Cherry pick branch 'genexuslabs:fix/strcmp-null-vs-empty' into beta

Author: iroqueta

common/src/main/java/com/genexus/CommonUtil.java

@@ -19,6 +19,7 @@
 import java.math.BigInteger;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.util.Comparator;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -853,8 +854,12 @@ public static boolean dateCompare( Date left , Date right)
    	public static int strcmp( String left ,
                              String right )
    	{
-               return rtrim(left).compareTo(rtrim(right));
-   	}
+		return Comparator.nullsFirst(String::compareTo)
+			.compare(
+				left  == null ? null : rtrim(left),
+				right == null ? null : rtrim(right)
+			);
+	}
 
    	public static boolean strcmp2( String left ,
                              String right )