":breakadd func" on empty function breaks on any subsequent vimscript

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What steps will reproduce the problem?
1. Define an empty "Foo" function in vimscript (":func Foo()", ":endfunction")
2. Execute ":breakadd func Foo"
3. Execute ":call Foo()"

What is the expected output? What do you see instead?
The interpreter should break inside the empty function, on the "endfunction" 
line or something. Instead, ":call Foo()" doesn't trigger the breakpoint at 
all, but it breaks later when some other vimscript executes.

What version of the product are you using? On what operating system?
vim 7.4.622 on Ubuntu Linux 14.04

Original issue reported on code.google.com by [email protected] on 12 Mar 2015 at 6:04