Quick fix PHP notices in various files

- Remove unused variables
- Fix variable name typos
- Use x() and defaults() to fix undefined index
- Add back uninitialized variables

src/Core/Worker.php

@@ -606,6 +606,7 @@ class Worker
 			$exponent = 3;
 			$slope = $maxworkers / pow($maxsysload, $exponent);
 			$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
+			$processlist = '';
 
 			if (Config::get('system', 'worker_debug')) {
 				// Create a list of queue entries grouped by their priority

src/Model/Contact.php

@@ -662,7 +662,7 @@ class Contact extends BaseObject
 		if (!DBM::is_result($contact)) {
 			// The link could be provided as http although we stored it as https
 			$ssl_url = str_replace('http://', 'https://', $url);
-			$r = dba::select('contact', array('id', 'avatar-date'), array('`alias` IN (?, ?, ?) AND `uid` = ?', $url, normalise_link($url), $ssl_url, $uid), array('limit' => 1));
+			$r = dba::select('contact', array('id', 'avatar', 'avatar-date'), array('`alias` IN (?, ?, ?) AND `uid` = ?', $url, normalise_link($url), $ssl_url, $uid), array('limit' => 1));
 			$contact = dba::fetch($r);
 			dba::close($r);
 		}
@@ -674,7 +674,7 @@ class Contact extends BaseObject
 			$update_contact = ($contact['avatar-date'] < datetime_convert('', '', 'now -7 days'));
 
 			// We force the update if the avatar is empty
-			if ($contact['avatar'] == '') {
+			if (!x($contact, 'avatar')) {
 				$update_contact = true;
 			}
 

src/Network/Probe.php

@@ -330,7 +330,7 @@ class Probe
 			$data["url"] = $uri;
 		}
 
-		if ($data["photo"] != "") {
+		if (x($data, "photo")) {
 			$data["baseurl"] = matching_url(normalise_link($data["baseurl"]), normalise_link($data["photo"]));
 		} else {
 			$data["photo"] = System::baseUrl().'/images/person-175.jpg';
@@ -341,7 +341,7 @@ class Probe
 				$data["name"] = $data["nick"];
 			}
 
-			if ($data["name"] == "") {
+			if (!x($data, "name")) {
 				$data["name"] = $data["url"];
 			}
 		}