Indentation: Fix crash caused by multiline case statements that fall through.

Fixes #459

Author: mikesherov

lib/rules/validate-indentation.js

@@ -212,10 +212,15 @@ module.exports.prototype = {
                 var childrenProperty = indentableNodes[node.type];
                 var children = node[childrenProperty];
 
-                if (children.length > 1 || children[0].type !== 'BlockStatement') {
+                if (children.length > 1 ||
+                    (children[0] && children[0].type !== 'BlockStatement')) {
                     markChildren(node);
                     markPop(node, 1, true);
                     markPushAndCheck(node, 1);
+                } else if (children.length === 0) {
+                    linesToCheck[node.loc.start.line - 1].push = 1;
+                    linesToCheck[node.loc.start.line - 1].check = true;
+                    markPop(node, 1, true);
                 }
             });
 

test/data/validate-indentation.js

@@ -392,3 +392,17 @@ var a = b.c(function() {
       d++;
     }),
     e;
+
+switch (true) {
+  case (a
+  && b):
+case (c // ->
+&& d):
+    case (e // <-
+    && f):
+  case (g
+&& h):
+      var i = j; // <-
+    var k = l;
+  var m = n; // ->
+}

test/rules/validate-indentation.js

@@ -119,7 +119,11 @@ describe('rules/validate-indentation', function() {
             379,
             380,
             386,
-            388
+            388,
+            399,
+            401,
+            405,
+            407
         ]);
     });
 });