some nits when git is not properly configured

Author: zaggino

src/BracketsEvents.js

@@ -36,7 +36,7 @@ define(function (require) {
 
 	FileSystem.on("change", function (evt, file) {
         // we care only for files in current project
-        if (file.fullPath.indexOf(Utils.getProjectRoot()) === 0) {
+        if (file && file.fullPath.indexOf(Utils.getProjectRoot()) === 0) {
             EventEmitter.emit(Events.BRACKETS_FILE_CHANGED, evt, file);
         }
     });

src/Branch.js

@@ -315,6 +315,8 @@ define(function (require, exports) {
     }
 
     function refresh() {
+        if ($gitBranchName.length === 0) { return; }
+
         // show info that branch is refreshing currently
         $gitBranchName
             .text("\u2026")

src/GutterManager.js

@@ -16,7 +16,7 @@ define(function (require, exports) {
         Strings         = require("strings");
 
     var currentFilePath = null,
-        guttersEnabled = true,
+        guttersEnabled = false,
         cm = null,
         results = null,
         gutterName = "brackets-git-gutter",