#154 df row count is wrong

[Michele Gubian]

quietly include Models/ia.eNm
quietly ia stage
(words default_observer) enable
(brief_masked default_observer) clear
(words default_observer) clear
quietly brief_masked step mask_duration=25 stimulus=mave stimulus_duration=15
(words default_observer)
ANSWER: (words default_observer) is a dataframe/dataframe_for_activities: ... rows: 44; columns: 1180;

but:
(words default_observer) get 1-80 1-2
ANSWER: time (words state).able
ANSWER: 0000timeout -0.01181
ANSWER: 0001timeout -0.01181
ANSWER: 0002 0 -0.01181
ANSWER: 0003 1 -0.01181
...
ANSWER: 0041 39 -0.0433948
ANSWER: 0042 40 -0.0414136
END: [249] (words default_observer) get 1-80 1-2, no return object

row count should be 43, not 44.
Col count is correct.