Add error-handling to WillFarrell\AlfredPkgMan\Npm

* Deal w/ an optional attribute for NPM modules
* Disable error reporting
    - PHP will echo warning & error messages by default, so in order to
avoid polluting what Alfred processes, we disable reporting

Fixes #165

src/Npm.php

@@ -1,6 +1,9 @@
 <?php
 namespace WillFarrell\AlfredPkgMan;
 
+// README: Turn off all error reporting
+// Comment this out to enable error reporting for debugging
+error_reporting(0);
 
 class Npm extends Repo
 {
@@ -20,10 +23,17 @@ public function search($query)
             $query,
             "{$this->search_url}{$query}&size={$this->max_return}"
         );
+
         foreach ($this->pkgs->results as $pkg) {
-            $p = $pkg->package;
+            $p    = $pkg->package;
             $name = $p->name;
-            $uid = "{$this->id}-{$name}-{$p->version}";
+            $uid  = "{$this->id}-{$name}-{$p->version}";
+
+            // README: Description is not required to publish a module, so we check for it
+            //          and fall back to an empty string if it is missing
+            $p->description
+                ? $description = $p->description
+                : $description = '';
 
             $this->cache->w->result(
                 $uid,