Fix potentially server-crashing NPE

Whoops.

OpenInvPlugin/src/main/resources/plugin.yml

@@ -1,39 +0,0 @@
-name: OpenInv
-main: com.lishid.openinv.OpenInv
-version: ${project.version}
-author: lishid
-authors: [Jikoo]
-description: >
-             This plugin allows you to open a player's inventory as a chest and interact with it in real time.
-commands:
-  openinv:
-    aliases: [oi, inv, open]
-    description: Open a player's inventory
-    permission: OpenInv.*;OpenInv.openinv
-    usage: |
-           /<command> - Open last person's inventory
-           /<command> <Player> - Open a player's inventory
-  openender:
-    aliases: [oe]
-    description: Opens the enderchest of a player
-    permission: OpenInv.*;OpenInv.openender
-    usage: |
-           /<command> <Player> - Opens a player's enderchest
-  searchinv:
-    aliases: [si]
-    description: Search and list players having a specific item
-    permission: OpenInv.*;OpenInv.search
-    usage: |
-           /<command> <Item> [MinAmount] - Item can be the Item ID or the CraftBukkit Item Name, MinAmount is the minimum amount to be considered.
-  silentchest:
-    aliases: [sc, silent]
-    description: Toggle silent chest function, which hides the animation of a chest when opened or closed, and suppresses the sound.
-    permission: OpenInv.*;OpenInv.silent
-    usage: |
-           /<command> [Check] - Checks whether silent chest is enabled
-  anychest:
-    aliases: [ac]
-    description: Toggle anychest function, which allows opening of blocked chests.
-    permission: OpenInv.*;OpenInv.anychest
-    usage: |
-           /<command> [Check] - Checks whether anychest is enabled