cubefunctions: fix compatibility with develop branch

cell/model/FormulaObjects/cubeFunctions.js

@@ -271,7 +271,7 @@
 
 			function cellForge(cell) {
 				if (cell) {
-					if (cell.oValue.type === cElementType.error) {
+					if (cell.type === cElementType.error) {
 						// debugger;
 						throw "referenced cell contain error";
 					}
@@ -614,8 +614,6 @@
 					new_member = level[member.level_index + offset.offsetCol + offset.offsetRow];
 					if (new_member) {
 						elem.value = new_member.uname;
-					} else {
-						elem.value = "";
 					}
 				}
 			}