fix led model bug

ObservationSim/sim_steps/__init__.py

@@ -13,6 +13,7 @@ class SimSteps:
     from .add_pattern_noise import apply_PRNU, add_poisson_and_dark, add_detector_defects, add_nonlinearity, add_blooming, add_bias
     from .add_brighter_fatter_CTE import add_brighter_fatter, apply_CTE
     from .readout_output import add_prescan_overscan, add_readout_noise, apply_gain, quantization_and_output
+    from .add_LED_flat import add_LED_Flat
 
 SIM_STEP_TYPES = {
     "scie_obs": "add_objects",

ObservationSim/sim_steps/add_LED_flat.py

 import numpy as np
 from ObservationSim.MockObject import FlatLED
+import galsim
 
 def add_LED_Flat(self, chip, filt, tel, pointing, catalog, obs_param):
         

ObservationSim/sim_steps/add_sky_background.py

 import numpy as np
 import galsim
 from ObservationSim.Straylight import calculateSkyMap_split_g
+from ObservationSim.Instrument import FilterParam
 
 def add_sky_background_sci(self, chip, filt, tel, pointing, catalog, obs_param):
     flat_normal = np.ones_like(chip.img.array)