Fix functions inside empty() construct

qa-include/qa-page-question-post.php

@@ -450,7 +450,7 @@
 
 		if ($question['isbyuser']) {
 			$in['name']=qa_post_text('q_name');
-			$in['notify'] = !empty(qa_post_text('q_notify'));
+			$in['notify'] = qa_post_text('q_notify') !== null;
 			$in['email']=qa_post_text('q_email');
 		}
 
@@ -781,7 +781,7 @@
 
 		if ($answer['isbyuser']) {
 			$in['name']=qa_post_text($prefix.'name');
-			$in['notify'] = !empty(qa_post_text($prefix.'notify'));
+			$in['notify'] = qa_post_text($prefix.'notify') !== null;
 			$in['email']=qa_post_text($prefix.'email');
 		}
 
@@ -982,7 +982,7 @@
 
 		if ($comment['isbyuser']) {
 			$in['name']=qa_post_text($prefix.'name');
-			$in['notify'] = !empty(qa_post_text($prefix.'notify'));
+			$in['notify'] = qa_post_text($prefix.'notify') !== null;
 			$in['email']=qa_post_text($prefix.'email');
 		}
 

qa-include/qa-page-question-submit.php

@@ -324,7 +324,7 @@
 	{
 		$in=array(
 			'name' => qa_post_text('a_name'),
-			'notify' =>  !empty(qa_post_text('a_notify')),
+			'notify' =>  qa_post_text('a_notify') !== null,
 			'email' => qa_post_text('a_email'),
 			'queued' => qa_user_moderation_reason(qa_user_level_for_post($question)) !== false,
 		);
@@ -386,7 +386,7 @@
 
 		$in=array(
 			'name' => qa_post_text($prefix.'name'),
-			'notify' => !empty(qa_post_text($prefix.'notify')),
+			'notify' => qa_post_text($prefix.'notify') !== null,
 			'email' => qa_post_text($prefix.'email'),
 			'queued' => qa_user_moderation_reason(qa_user_level_for_post($parent)) !== false,
 		);