[BUG] - ord_red in def_geo2

[dfm88]

Describe the bug

Method oma.BaseSetup.plot_geo2 seems not to handle correctly all Geo2.order_red values

To Reproduce

Call def_geo2 in Example1_SingleSetup.ipynb file with the following order_red:

• None
• xz
• y

it will fail on line 412 cause it is trying to set to np.NaN that is internally a float, some integers number in the pandas dataframe

Desktop (please complete the following information):

• OS: [e.g. iOS] Windows11

Additional context

Some issue can be solved by forcing s_sign and ch_names to float

        s_sign = s_sign.astype(float)  # allow setting nan

        if ord_red is None:
            pass
        # ecc...

[dfm88]

fixed converting the numpy array to float