NPE DatabaseManager.isPlayerLocked

[erocs]

Probably related to #101.

[18:28:50 WARN]: Caused by: java.lang.NullPointerException
[18:28:50 WARN]: at vg.civcraft.mc.bettershards.database.DatabaseManager.isPlayerLocked(DatabaseManager.java:488)
[18:28:50 WARN]: at vg.civcraft.mc.bettershards.database.DatabaseManager$4.call(DatabaseManager.java:739)
[18:28:50 WARN]: at vg.civcraft.mc.bettershards.database.DatabaseManager$4.call(DatabaseManager.java:732)