Fix creative tanks only outputting up to 1kL at a time

Author: Zorbatron

src/main/java/gregtech/common/metatileentities/storage/MetaTileEntityCreativeTank.java

@@ -129,7 +129,7 @@ public void update() {
             if (fluidHandler == null || fluidHandler.getTankProperties().length == 0)
                 return;
 
-            FluidStack stack = fluidTank.getFluid().copy();
+            FluidStack stack = fluidTank.getFluid();
             int canInsertAmount = fluidHandler.fill(stack, false);
             stack.amount = Math.min(mBPerCycle, canInsertAmount);
 
@@ -231,5 +231,17 @@ public FluidStack drain(int maxDrain, boolean doDrain) {
         public int fill(FluidStack resource, boolean doFill) {
             return 0;
         }
+
+        @Override
+        public FluidStack getFluid() {
+            FluidStack fluid = super.getFluid();
+
+            if (fluid != null) {
+                fluid = fluid.copy();
+                fluid.amount = mBPerCycle;
+            }
+
+            return fluid;
+        }
     }
 }