MINOR Security::database_is_ready() check are doing duplicate DB quer…

…ies for Members.

The will make sure that if the database has been ready once, it is ready for the rest of the request

security/Security.php

@@ -104,6 +104,14 @@ static function get_word_list() {
 	 */
 	static $force_database_is_ready = null;
 
+	/**
+	 * When the database has once been verified as ready, it will not do the
+	 * checks again.
+	 *
+	 * @var bool
+	 */
+	protected static $database_is_ready = false;
+
 	/**
 	 * Set location of word list file
 	 * 
@@ -800,6 +808,8 @@ static function encrypt_password($password, $salt = null, $algorithm = null, $me
 	public static function database_is_ready() {
 		// Used for unit tests
 		if(self::$force_database_is_ready !== NULL) return self::$force_database_is_ready;
+
+		if(self::$database_is_ready) return self::$database_is_ready;
 
 		$requiredTables = ClassInfo::dataClassesFor('Member');
 		$requiredTables[] = 'Group';
@@ -822,6 +832,7 @@ public static function database_is_ready() {
 
 			if($missingFields) return false;
 		}
+		self::$database_is_ready = true;
 
 		return true;
 	}