[Rd] data editor freeze on empty data frame (PR#622)

[pd@blueberry.kubism.ku.dk]

It is quite tempting to start simple data entry sessions where
you need to type in the data like this:

my.frame<-data.frame(a=numeric(0),b=numeric(0))
fix(my.frame)

(and if factors are involved, that is pretty much what you'd have to do
in order to get the appropriate levels)

However, in the X version, this seems to cause the data editor to
freeze as soon as one hits Enter after inserting data into the
first cell. I haven't tried the Windows version yet.

[This is something it would be nice to have resolved in 1.1.1]

--please do not edit the information below--

Version:
 platform = i586-pc-linux-gnu
 arch = i586
 os = linux-gnu
 system = i586, linux-gnu
 status = Patched
 major = 1
 minor = 1.0
 year = 2000
 month = August
 day = 1
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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