Stop parsing if the author isn't found

The author file is now checked to insure it's non-zero before attempting
to parse it for the author who's byline will be displayed at the bottom
of the post.

common/php/article.php

@@ -22,20 +22,17 @@
   
   echo "\n</div><!--End of print-content div-->\n";
   echo("<nav class=\"jmenu\"><div class=\"pmenu\"><ul id=\"back_btn\"><li><a href='..'>Back</a></li></ul></div></nav>\n");
-  if (file_exists('author')){
-	  $author_name_raw = fopen('author', 'r');
-	  $author_name = fread($author_name_raw, filesize('author'));
-	  $author_name = str_replace("\n", "", $author_name);
-	  $byline_path = $_SERVER['DOCUMENT_ROOT'].'blog/authors/'.$author_name.'/byline.md';
-	  if (file_exists($byline_path)){
-		  echo "<div class =\"byline\">\n"
-			  . read_md($byline_path)
-		  	."</div><!--End byline div-->\n";
-	  } else {
-		  echo "<h2>No byline</h2>";
-		  echo "<p>$byline_path</p>";
-	  }
-	  fclose($author_name_raw);
+  if (file_exists('author') && (filesize('author') != 0)){
+    $author_name_raw = fopen('author', 'r');
+    $author_name = fread($author_name_raw, filesize('author'));
+    $author_name = str_replace("\n", "", $author_name);
+    $byline_path = $_SERVER['DOCUMENT_ROOT'].'blog/authors/'.$author_name.'/byline.md';
+    if (file_exists($byline_path)){
+      echo "<div class =\"byline\">\n"
+        . read_md($byline_path)
+        ."</div><!--End byline div-->\n";
+    }
+    fclose($author_name_raw);
   }
   if ($tag_data != NULL){
     $page_tags = str_getcsv($tag_data);