make sure that broken paths are not added to fs.cache

package.json

@@ -57,9 +57,9 @@
         "c9.ide.language.javascript": "#ec9ecf31cf",
         "c9.ide.language.javascript.immediate": "#9a2cce9121",
         "c9.ide.language.javascript.eslint": "#8832423ad1",
-        "c9.ide.language.javascript.tern": "#008c837519",
+        "c9.ide.language.javascript.tern": "#7aab8b0b6a",
         "c9.ide.language.javascript.infer": "#ebb2daf81a",
-        "c9.ide.language.jsonalyzer": "#3ae6c1545b",
+        "c9.ide.language.jsonalyzer": "#d82c60fcb9",
         "c9.ide.collab": "#b94018ab2b",
         "c9.ide.local": "#2bfd7ff051",
         "c9.ide.find": "#989c06e6a7",

plugins/c9.fs/fs.cache.xml.js

@@ -480,6 +480,11 @@ define(function(require, exports, module) {
         }
         
         function createNode(path, stat, updateNode, updating) {
+            if (!/^[!~/]/.test(path)) {
+                var e = new Error("Refusing to add a node with misformed path to fs.cache");
+                return reportError(e, { path: path });
+            }
+            
             if (orphans[path]) {
                 updateNode = orphans[path];
                 delete orphans[path];

plugins/c9.fs/fs.js

@@ -63,6 +63,13 @@ define(function(require, exports, module) {
                 if (typeof args[args.length - 1] != "function")
                     throw new Error("Missing callback for " + name);
                     
+                if (!/^[!~/]/.test(path)) {
+                    var e = new Error("Invalid path passed to fs");
+                    e.data = { name: name, path: path };
+                    setTimeout(function() { throw e });
+                    return args[args.length - 1](e);
+                }
+
                 var original_callback = args.pop();
                 
                 // Add progress event for readFile / writeFile

plugins/c9.ide.tree/tree.js

@@ -961,10 +961,15 @@ define(function(require, exports, module) {
                 if (node === false || path.charAt(0) == "!") 
                     return increment();
                 
+                if (!/^[!~/]/.test(path)) {
+                    console.error("invalid path", path);
+                    delete expandedList[path];
+                    return increment();
+                }
+                
                 if (node && node.status == "loaded") {
                     expandNode(node);
-                    increment();
+                    return increment();
-                    return;
                 }
                 
                 fs.readdir(path, function(err, data) {