Added check if article was found

1stPara.php

@@ -9,6 +9,13 @@ if (!isset($argv[1]))
 $url = $argv[1];
 $data = shell_exec("curl -s $url");
 preg_match("/\<p\>(.*)\<\/p\>/", $data, $match);
+
+if (!isset($match[1]))
+{
+    print "No Wikipedia article found at that URL\n";
+    exit(1);
+}
+
 $string = strip_tags($match[1]);
 print (wordwrap($string, 60, "\n") . "\n");