requireAlignedMultilineParams: do not throw on function without body

Fixes #1988

Author: markelog

lib/rules/require-aligned-multiline-params.js

@@ -99,10 +99,20 @@ module.exports.prototype = {
 
             var currentLine = params[0].loc.start.line;
             var referenceColumn;
+            var body;
+
             if (_this._alignWithFirstParam) {
                 referenceColumn = params[0].loc.start.column;
             } else {
-                referenceColumn = node.body.body[0].loc.start.column + _this._indentationLevel;
+
+                body = node.body.body[0];
+
+                // If function doesn't have a body just bail out (#1988)
+                if (!body) {
+                    return;
+                }
+
+                referenceColumn = body.loc.start.column + _this._indentationLevel;
             }
 
             params.forEach(function(param) {

test/specs/rules/require-aligned-multiline-params.js

@@ -43,6 +43,12 @@ describe('rules/require-aligned-multiline-params', function() {
             expect(checker.checkString(noParamFunction)).to.have.no.errors();
         });
 
+        it('should validate a function without body properly', function() {
+            var noParamFunction = 'var noBody = function(a) {};';
+
+            expect(checker.checkString(noParamFunction)).to.have.no.errors();
+        });
+
         it('should validate a function with a single line of params properly', function() {
             var singleLineFunction = 'var singleLineFunction = function(a, b, c) { \n' +
                                      '  console.log(a + b + c);\n' +
@@ -72,6 +78,15 @@ describe('rules/require-aligned-multiline-params', function() {
                 'requireAlignedMultilineParams');
         });
 
+        it('should bail out with function without a body', function() {
+            var unalignedFunction = 'var unalignedFunction = function(a,\n' +
+                                    '  b, c,\n' +
+                                    '   d, e) {\n' +
+                                    '};';
+
+            expect(checker.checkString(unalignedFunction)).to.have.no.errors();
+        });
+
         it('should validate a function with two unaligned params properly', function() {
             var unalignedFunction = 'var unalignedFunction = function(a,\n' +
                                     '  b, c,\n' +