List index error when using the view method combined scaling relation instances, if they have the same colour set

[DavidT3]

This hasn't been an issue where each scaling relation that is being shown on the same axis has had a distinct colour assigned, because you wouldn't want to plot things with the same colour on the same axis.

But where no model colour has been set for a particular relation, it will default to the same value (or if the user just sets a bunch to have the same colour accidentally), and then you get the following error:

IndexError Traceback (most recent call last)
Cell In[15], line 1
----> 1 AggregateScalingRelation(list(sub_samp_mtot500_tx500.values())).view()

File ~/software/anaconda3/envs/xga_env/lib/python3.12/site-packages/xga/products/relation.py:1509, in AggregateScalingRelation.view(self, x_lims, log_scale, plot_title, figsize, colour_list, grid_on, conf_level, show_data, fontsize, legend_fontsize, x_ticks, x_minor_ticks, y_ticks, y_minor_ticks, save_path, data_colour_list, data_shape_list, custom_x_label, custom_y_label, y_lims, one_to_one)
1504 d_out = ax.errorbar(None, None, xerr=None, yerr=None, fmt=data_shape_list[rel_ind], capsize=2, label='',
1505 color=data_colour_list[rel_ind])
1506 else:
1507 d_out = ax.errorbar(rel.x_data.value[:, 0], rel.y_data.value[:, 0], xerr=rel.x_data.value[:, 1],
1508 yerr=rel.y_data.value[:, 1], fmt=data_shape_list[rel_ind], capsize=2,
-> 1509 color=data_colour_list[rel_ind], alpha=0.7)
1511 m_colour = colour_list[rel_ind]
1513 # Need to randomly sample from the fitted model

IndexError: list index out of range