Add in a few null checks

These were discovered by using a project that was messed up with the moving
folder bug where the folder ended up without an id, docs or fileRefs array

services/web/app/coffee/Features/Project/ProjectEditorHandler.coffee

@@ -46,12 +46,12 @@ module.exports = ProjectEditorHandler =
 		signUpDate : user.signUpDate
 
 	buildFolderModelView: (folder) ->
-		fileRefs = _.filter folder.fileRefs, (file)-> file?
+		fileRefs = _.filter (folder.fileRefs or []), (file)-> file?
 		_id        : folder._id
 		name       : folder.name
-		folders    : @buildFolderModelView childFolder for childFolder in folder.folders
+		folders    : @buildFolderModelView childFolder for childFolder in (folder.folders or [])
 		fileRefs   : @buildFileModelView file for file in fileRefs
-		docs       : @buildDocModelView doc for doc in folder.docs
+		docs       : @buildDocModelView doc for doc in (folder.docs or [])
 
 	buildFileModelView: (file) ->
 		_id  : file._id

services/web/app/coffee/Features/Project/ProjectEntityHandler.coffee

@@ -22,7 +22,9 @@ module.exports = ProjectEntityHandler =
 		folders = {}
 		processFolder = (basePath, folder) ->
 			folders[basePath] = folder
-			processFolder path.join(basePath, childFolder.name), childFolder for childFolder in folder.folders
+			for childFolder in (folder.folders or [])
+				if childFolder.name?
+					processFolder path.join(basePath, childFolder.name), childFolder
 
 		ProjectGetter.getProjectWithoutDocLines project_id, (err, project) ->
 			return callback(err) if err?
@@ -43,11 +45,11 @@ module.exports = ProjectEntityHandler =
 			for docContent in docContentsArray
 				docContents[docContent._id] = docContent
 
-			ProjectEntityHandler.getAllFolders project_id, (error, folders) ->
+			ProjectEntityHandler.getAllFolders project_id, (error, folders = {}) ->
 				return callback(error) if error?
 				docs = {}
 				for folderPath, folder of folders
-					for doc in folder.docs
+					for doc in (folder.docs or [])
 						content = docContents[doc._id.toString()]
 						if content?
 							docs[path.join(folderPath, doc.name)] = {
@@ -61,11 +63,11 @@ module.exports = ProjectEntityHandler =
 
 	getAllFiles: (project_id, callback) ->
 		logger.log project_id:project_id, "getting all files for project"
-		@getAllFolders project_id, (err, folders) ->
+		@getAllFolders project_id, (err, folders = {}) ->
 			return callback(err) if err?
 			files = {}
 			for folderPath, folder of folders
-				for file in folder.fileRefs
+				for file in (folder.fileRefs or [])
 					if file?
 						files[path.join(folderPath, file.name)] = file
 			callback null, files

services/web/app/coffee/Features/References/ReferencesHandler.coffee

@@ -20,13 +20,13 @@ module.exports = ReferencesHandler =
 		ids = []
 
 		_process = (folder) ->
-			folder.docs.forEach (doc) ->
+			(folder.docs or []).forEach (doc) ->
 				if doc?.name?.match(/^.*\.bib$/)
 					ids.push(doc._id)
-			folder.folders.forEach (folder) ->
+			(folder.folders or []).forEach (folder) ->
 				_process(folder)
 
-		project.rootFolder.forEach (rootFolder) ->
+		(project.rootFolder or []).forEach (rootFolder) ->
 			_process(rootFolder)
 
 		return ids