Fix event logos error when teams are not selected

includes/sp-formatting-functions.php

@@ -63,6 +63,17 @@ function sp_array_overlay( $a1, $a2 ) {
     return $a1;
 }
 
+/**
+ * Array filter returns positive values only.
+ *
+ * @access public
+ * @param int $var
+ * @return bool
+ */
+function sp_filter_positive( $var = 0 ) {
+	return $var > 0;
+}
+
 /**
  * let_to_num function.
  *