Issue in _verify_indicators, MissingIndicator is raised when jsut not generated,

[MerlinR]

If you are calling any movement tools via Hexital such as crossover, while your receiving new data, E.G 2 candles with 14 EMA than no EMA is yet generated so you get the exception "MissingIndicator" when it simply hasn't started generating yet.

_verify_indicators Need's a re-write to check internal known indicators.