Assign econ if #setupEconomy doesn't fail

plugin/src/main/java/com/alttd/playershops/PlayerShops.java

@@ -16,7 +16,7 @@ public class PlayerShops extends JavaPlugin {
     @Getter
     private static PlayerShops instance;
     @Getter
-    private Economy econ;
+    private Economy econ = null;
     @Getter
     private ShopHandler shopHandler;
 
@@ -47,6 +47,7 @@ public class PlayerShops extends JavaPlugin {
         if (rsp == null) {
             return false;
         }
+        econ = rsp.getProvider();
         return true;
     }