ERG load routine generates warnings about missing tplot variables if varformat is specified

[jameswilburlewis]

erg_orb_vars = pyspedas.erg.orb(trange=trange, varformat='*pos_gse')

Output:

13-May-24 15:42:47: erg_orb_l2_pos_blocal is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_blocal_mag is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_beq is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_Lm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_gse is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_gsm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_sm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_gsm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_sm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_rmlatmlt is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_blocal is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_beq is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_Lm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_gse is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_gsm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_vel_sm is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_blocal_mag is currently not in pytplot.
13-May-24 15:42:47: erg_orb_l2_pos_beq is currently not in pytplot.