cannot make prediction of dummy component set without tzone attr

[veenstrajelmer]

The code below raises "KeyError: 'tzone'" due to tzone_comp = metadata_comp.pop('tzone'):

import pandas as pd
import hatyan

comp = pd.DataFrame({"A": [1, 0.5, 0.2],
                     "phi_deg": [10,15,20]}, 
                    index=["M2","M4","S2"])
comp.attrs["nodalfactors"] = True
comp.attrs["fu_alltimes"] = True
comp.attrs["xfac"] = False
comp.attrs["source"] = "schureman"
dtindex = pd.date_range("2020-01-01","2024-01-01", freq="10min")
pred = hatyan.prediction(comp, times=dtindex)

Todo:

• [x] check for tzone attr before removing it, tzone attr is only required for hatyan.write_components(), not for hatyan.prediction() >> no
• [x] instead, add None as fillvalue for .pop
• [x] add testcase
• [x] update whatsnew