Bug: org-plot gives Invalid function error

[ian martins <ianxm@jhu.edu>]

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I went to test the "Refresh inline" patch [1] and found that org-plot is
broken for me. it
seems to have broken in 1ac45d76e. I tested with =emacs -Q= (but loaded
Org from master and gnuplot.el manually).  I was running the example from
 the doc [2]. I tested on linux and mac, both using emacs 26.3, and got the
same result.

The error message is:

    org-plot/gnuplot: Invalid function: (dump-func (plist-get type
:data-dump))

But if I manually load =org-plot.el= it doesn't give that error, but
still doesn't produce a plot.  I'm not sure what manually loading
=org-plot.el= does since I'd just done a "make clean; make" and restarted.

In the second case (after manually loading =org-plot.el=), this is what is
in
the *gnuplot* buffer:

    Terminal type is now 'qt'
    gnuplot> reset
    gnuplot> set term GNUTERM

    Terminal type is now 'qt'
    Options are '0 font "Sans,9"'
    gnuplot>
    gnuplot> set title 'Citas'
    gnuplot> set yrange [0:]
    gnuplot> set yrange [0:]
    gnuplot> set datafile separator "\t"
    gnuplot> plot '/tmp/org-plotiPs0To' using 1:3 with histograms title
'H-index'
             warning: Skipping data file with no valid points

     ^
             x range is invalid

this is the data file:

    "Chile" 257.72 21.39
    "Leeds" 165.77 19.68
    "Sao Paolo" 71.00 11.50
    "Stockholm" 134.19 14.33
    "Morelia" 257.56 17.67

I'll try to look into it more later.

[1] https://orgmode.org/list/87r1j0mg56.fsf@gmail.com/
[2] https://orgmode.org/manual/Org-Plot.html#Org-Plot

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