browse-url-mozilla won't work without new-window set

browse-url-mozilla won't work without new-window set

[mah]

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In GNU Emacs 21.2.2 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-10-15 on raven, modified by Debian
configured using `configure  i386-linux --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes --with-x-toolkit=athena --without-gif'

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

browse-url-mozilla has a line the following line:

    (if new-window ",new-window")

However, if new-window is false, then nil is returned and the
surrounding function (start-process) fails because it is
expecting a string.  Fix is to change the line to:

    (if new-window ",new-window" "")

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