fix epc notices

Index: class.email-post-changes.php
===================================================================
--- class.email-post-changes.php    (revision 784251)
+++ class.email-post-changes.php    (working copy)
@@ -12,7 +12,7 @@
    const OPTION_GROUP = 'email_post_changes';
    const OPTION = 'email_post_changes';

-   function init() {
+   static function init() {
        static $instance = null;

        if ( $instance )
@@ -100,8 +100,8 @@
            $left  = normalize_whitespace( $left );
            $right = normalize_whitespace( $right );

-           $left_lines  = split( "\n", $left );
-           $right_lines = split( "\n", $right );
+           $left_lines  = explode( "\n", $left );
+           $right_lines = explode( "\n", $right );

            require_once( dirname( __FILE__ ) . '/unified.php' );

@@ -294,9 +294,8 @@
            else
                $return['emails'] = $this->defaults['emails'];
        } else {
-           if ( is_string( $options['emails'] ) )
-               $_emails = preg_split( '(\n|\r)', $options['emails'], -1, PREG_SPLIT_NO_EMPTY );
-           $_emails = array_unique( (array) $_emails );
+           $_emails = is_string( $options['emails'] ) ? preg_split( '(\n|\r)', $options['emails'], -1, PREG_SPLIT_NO_EMPTY ) : array();
+           $_emails = array_unique( $_emails );
            $emails = array_filter( $_emails, 'is_email' );

            $invalid_emails = array_diff( $_emails, $emails );
@@ -311,7 +310,7 @@
                $return['emails'] = $this->defaults['emails'];

            // Don't store a huge list of invalid emails addresses in the option
-           if ( count( $return['invalid_emails'] ) > 200 ) {
+           if ( isset ( $return['invalid_emails'] ) && count( $return['invalid_emails'] ) > 200 ) {
                $return['invalid_emails'] = array_slice( $return['invalid_emails'], 0, 200 );
                $return['invalid_emails'][] = __( 'and many more not listed here' );
            }