Change to hasOwnProperty

lib/dialects/mysql/query-generator.js

@@ -155,7 +155,7 @@ module.exports = (function() {
         options.attributes = optAttributes.join(', ')
         options.attributes = optAttributes.join(', ')
       }
       }
 
 
-      if (options.where !== undefined) {
+      if (options.hasOwnProperty('where')) {
         options.where = this.getWhereConditions(options.where, tableName)
         options.where = this.getWhereConditions(options.where, tableName)
         query += " WHERE <%= where %>"
         query += " WHERE <%= where %>"
       }
       }

lib/dialects/postgres/query-generator.js

@@ -224,7 +224,7 @@ module.exports = (function() {
         options.attributes = optAttributes.join(', ')
         options.attributes = optAttributes.join(', ')
       }
       }
 
 
-      if(options.where != undefined) {
+      if(options.hasOwnProperty('where')) {
         options.where = QueryGenerator.getWhereConditions(options.where)
         options.where = QueryGenerator.getWhereConditions(options.where)
         query += " WHERE <%= where %>"
         query += " WHERE <%= where %>"
       }
       }