fix(find/where): dont crash on an empty where: [] array. fixes #2849

lib/dialects/abstract/query-generator.js

@@ -1504,6 +1504,8 @@ module.exports = (function() {
       } else if (Buffer.isBuffer(smth)) {
       } else if (Buffer.isBuffer(smth)) {
         result = this.escape(smth);
         result = this.escape(smth);
       } else if (Array.isArray(smth)) {
       } else if (Array.isArray(smth)) {
+        if (smth.length === 0) return '1=1';
+
         if (Utils.canTreatArrayAsAnd(smth)) {
         if (Utils.canTreatArrayAsAnd(smth)) {
           var _smth = self.sequelize.and.apply(null, smth);
           var _smth = self.sequelize.and.apply(null, smth);
           result = self.getWhereConditions(_smth, tableName, factory, options, prepend);
           result = self.getWhereConditions(_smth, tableName, factory, options, prepend);

test/model/findAll.test.js

@@ -549,6 +549,12 @@ describe(Support.getTestDialectTeaser('Model'), function() {
       });
       });
     });
     });
 
 
+    it('should not crash on an empty where array', function () {
+      return this.User.findAll({
+        where: []
+      });
+    });
+
     describe('eager loading', function() {
     describe('eager loading', function() {
       describe('belongsTo', function() {
       describe('belongsTo', function() {
         beforeEach(function(done) {
         beforeEach(function(done) {