php notice fixings

addons:
- bufferapp (missing errorcode)
- twitter (wrong field name 'nickname')
core:
- bbcode (incomplete attachementdata)
- crypto (uninitialized key)

src/Content/Text/BBCode.php

@@ -120,7 +120,16 @@ class BBCode extends BaseObject
 	 */
 	public static function getAttachmentData($body)
 	{
-		$data = [];
+		// Initialize empty data array
+		$data = [
+			'type'        => '',
+			'text'        => '',
+			'after'       => '',
+			'image'       => null,
+			'url'         => '',
+			'title'       => '',
+			'description' => '',
+		];
 
 		if (!preg_match("/(.*)\[attachment(.*?)\](.*?)\[\/attachment\](.*)/ism", $body, $match)) {
 			return self::getOldAttachmentData($body);

src/Util/Crypto.php

@@ -4,12 +4,12 @@
  */
 namespace Friendica\Util;
 
+use ASN_BASE;
+use ASNValue;
 use Friendica\Core\Config;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\System;
-use ASN_BASE;
-use ASNValue;
 
 /**
  * @brief Crypto class
@@ -209,9 +209,11 @@ class Crypto
 
 		$r = ASN_BASE::parseASNString($x);
 
+		if (isset($r[0])) {
 			$m = Strings::base64UrlDecode($r[0]->asnData[1]->asnData[0]->asnData[0]->asnData);
 			$e = Strings::base64UrlDecode($r[0]->asnData[1]->asnData[0]->asnData[1]->asnData);
 		}
+	}
 
 	/**
 	 * @param string $m modulo