remove faulty logic in update code

lib/dialects/mssql/query-generator.js

@@ -226,29 +226,27 @@ module.exports = (function() {
       var query;
       attrValueHash = Utils.removeNullValuesFromHash(attrValueHash, false, options);
 
-      //very unique case for cascades, i generally don't approve
-      if(Object.keys(attrValueHash).length === 1 && attributes[Object.keys(attrValueHash)[0]].primaryKey){
-        this.sequelize.log('Updating a Primary Key is not supported in MSSQL, please restructure your query');
-      }else{
-        for(var key in attributes){
+      for (var key in attributes) {
         var aliasKey = attributes[key].field || key;
-          if(attributes[key].primaryKey && attrValueHash[aliasKey]){
+        if (attributes[key].primaryKey && attrValueHash[aliasKey]) {
           delete attrValueHash[aliasKey];
         }
-          if(attrValueHash[aliasKey] && attrValueHash[aliasKey].fn){
+
+        if (attrValueHash[aliasKey] && attrValueHash[aliasKey].fn) {
 
         }
       }
-        if(!Object.keys(attrValueHash).length){
+
+      if (!Object.keys(attrValueHash).length) {
         return '';
         //return ['SELECT * FROM ', tableName, 'WHERE', this.getWhereConditions(where) + ';'].join(' ');
       }
+
       query = [
         SqlGenerator.updateSql(tableName, attrValueHash, attributes),
         'WHERE',
         this.getWhereConditions(where)
       ].join(' ') + ';';
-      }
 
       return query;
     },