ENA/PSAP/C1 - Reprocess: Ingest problem

A logic error in the code cause the program to fail when there was no impactor data 
available.

• AOS PSAP3W mass flow, mV(mass_flow_voltage)
• Absorption coefficient, blue wavelength, 3 wavelength PSAP, low RH, 10 um size
  cut(Ba_B_Dry_10um_PSAP3W_1)
• AOS PSAP3W flags(psap_flags)
• Absorption coefficient, green wavelength, 3 wavelength PSAP, low RH, 10 um size
  cut(Ba_G_Dry_10um_PSAP3W_1)
• Absorption Coefficient Red, corrected for flow and sample area, 3 wavelength
  PSAP, 10 um size cut(Ba_R_Dry_10um_PSAP3W_1)
• AOS PSAP3W transmittance, red channel(TrR)
• Mass flow(mass_flow)
• Absorption coefficient green, corrected for flow and sample area, 3 wavelength
  PSAP, 1 um size cut(Ba_G_Dry_1um_PSAP3W_1)
• Absorption coefficient, blue wavelength, 3 wavelength PSAP, low RH, 1 um size
  cut(Ba_B_Dry_1um_PSAP3W_1)
• AOS PSAP3W transmittance, green channel(TrG)
• Averaging time interval(averaging_time)
• AOS PSAP3W transmittance, blue channel(TrB)
• Absorption Coefficient Red, corrected for flow and sample area, 3 wavelength
  PSAP, 1 um size cut(Ba_R_Dry_1um_PSAP3W_1)

• Mass flow(mass_flow)
• Flow setpoint(dilution_flow_setpoint)
• AOS Ba_B_CLAP3W transmittance, blue channel(transmittance_B)
• Aerosol light absorption coefficient, nominal blue wavelength at dry or
  reference RH(Ba_B_PSAP3W)
• AOS PSAP3W transmittance, green channel(transmittance_G)
• Aerosol light absorption coefficient, nominal red wavelength at dry or reference
  RH(Ba_R_PSAP3W)
• Aerosol light absorption coefficient, nominal green wavelength at dry or
  reference RH(Ba_G_PSAP3W)
• Dilution flow rate(dilution_flow)
• Impactor setting in terms of aerodynamic diameter cut off(impactor_setting)
• Diffusion flow valve position(dilution_flow_valve_position)
• AOS Ba_R_CLAP3W transmittance, red channel(transmittance_R)