Index: res/res_config_mysql.c
===================================================================
--- res/res_config_mysql.c	(revision 933)
+++ res/res_config_mysql.c	(working copy)
@@ -169,18 +169,20 @@
 
 		while ((row = mysql_fetch_row(result))) {
 			for (i = 0; i < numFields; i++) {
-				if (ast_strlen_zero(row[i]))
-					continue;
+				/* Encode NULL values separately from blank values, for the Realtime API */
+				if (row[i] == NULL) {
+					row[i] = "";
+				} else if (ast_strlen_zero(row[i])) {
+					row[i] = " ";
+				}
 				for (stringp = ast_strdupa(row[i]), chunk = strsep(&stringp, ";"); chunk; chunk = strsep(&stringp, ";")) {
-					if (chunk && !ast_strlen_zero(ast_strip(chunk))) {
-						if (prev) {
-							prev->next = ast_variable_new(fields[i].name, chunk, "");
-							if (prev->next) {
-								prev = prev->next;
-							}
-						} else {
-							prev = var = ast_variable_new(fields[i].name, chunk, "");
+					if (prev) {
+						prev->next = ast_variable_new(fields[i].name, chunk, "");
+						if (prev->next) {
+							prev = prev->next;
 						}
+					} else {
+						prev = var = ast_variable_new(fields[i].name, chunk, "");
 					}
 				}
 			}