The aria-labelledby attribute on the fontPercent, edgeStyle, and
fontFamily select options inlcudes an extra space since there is
no ledgendId variable being set on the createElFont_() method. This
fix adds a check to see if the legendId value is set or not inside
the createElSelect_() method. This should keep the extra space
from appearing on the select tags created by the createElFont_()
method.
Fixes#4688
