Add more specific input checks for plot_emission_intensity and prep_emission_intensity
#1074
| Job | Run time |
|---|---|
| 3m 2s | |
| 4m 3s | |
| 5m 38s | |
| 6m 12s | |
| 2m 24s | |
| 2m 19s | |
| 2m 14s | |
| 3m 53s | |
| 2m 19s | |
| 2m 18s | |
| 34m 22s |