fixed crash from null crash in FluidController

Author: Trinsdar

common/src/main/java/tesseract/api/fluid/FluidController.java

@@ -117,8 +117,10 @@ public void insert(long producerPos, Direction side, FluidTransaction transactio
         Map<Direction, List<FluidConsumer>> map = this.data.get(Pos.offset(producerPos, side));
         if (map == null)
             return;
-        
+
         List<FluidConsumer> list = map.get(side);
+        if (list == null) return; //TODO figure out how this becomes null
+
         pressureData.clear();
 
         loop: for (FluidConsumer consumer : list) {