unsued demand?

[davide-f]

In sector-network there is the definition of these variables that are not used.
Is that ok?

pypsa-earth-sec/scripts/prepare_sector_network.py

Lines 2086 to 2104 in 0fcefa8

	oil_ind = (
	n.loads_t.p_set.filter(like="residential")
	.filter(like="oil")
	.dropna(axis=1)
	.columns
	)
	bio_ind = (
	n.loads_t.p_set.filter(like="residential")
	.filter(like="biomass")
	.dropna(axis=1)
	.columns
	)
	gas_ind = (
	n.loads_t.p_set.filter(like="residential")
	.filter(like="gas")
	.dropna(axis=1)
	.columns
	)