make "projects" and "maintainers" config keys optional

Author: rlidwka

scripts/config.js

@@ -18,7 +18,7 @@ try {
 //
 // maintainers data
 //
-config.maintainers = config.maintainers.map(function(maintainer) {
+config.maintainers = (config.maintainers || []).map(function(maintainer) {
   if (db.maintainers[maintainer.npm])
     mixin(maintainer, db.maintainers[maintainer.npm])
 
@@ -28,7 +28,7 @@ config.maintainers = config.maintainers.map(function(maintainer) {
 //
 // projects data
 //
-config.projects = config.projects.map(function(project) {
+config.projects = (config.projects || []).map(function(project) {
   if (typeof(project) === 'string') project = {name: project}
 
   // dealing with a bit weird edge-case in config file