Ticker.earnings_dates: fix warning "Value 'NaN' has dtype incompatible with float64" #1810
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/usr/local/lib/python3.9/site-packages/yfinance/base.py:2126: FutureWarning: Setting an item of incompatible dtype is deprecated and will raise in a future error of pandas. Value 'NaN' has dtype incompatible with float64, please explicitly cast to a compatible dtype first.
dates.loc[dates[cn] == '-', cn] = "NaN"