chart_Series theme is disturbed by add_TA

[helgasoft]

Description

Cannot hide vertical axis through custom theme when add_TA is present in chart_Series.

Expected behavior

add_TA should not interfere with the selected theme. add_BBands, for example, behaves correctly.

Minimal, reproducible example

getSymbols('T', from='2017-06-06')
myTheme <- chart_theme()
myTheme$rylab <- FALSE  		# hide right y-axis
chart_Series(T, theme=myTheme)	        # works ok
chart_Series(T, theme=myTheme, TA='add_TA(EMA(Cl(T)), on=1)')	# does not hide axis

[joshuaulrich]

Thanks for this, and your other chart_Series() reports. Please keep in mind that the chart_Series() code was moved to plot.xts() in xts 0.10-0, and the intention is to make chart_Series() use plot.xts() (see #94). So these reports are likely to remain unaddressed until that migration is complete.