bc with inexisting breakpoint id doesn't give any feedback

[GoogleCodeExporter]

What steps will reproduce the problem?
1. enter `bc x` where `x` is an inexisting breakpoint id (check with `bl` that 
it doesn't exist)
2.
3.

What is the expected output? What do you see instead?
An error message that the breakpoint with id `x` doesn't exist. This is 
especially important because beginners tend to request deletion of breakpoints 
based on the line number where the breakpoint has been created.

What version of the product are you using? On what operating system?


Please provide any additional information below.

Original issue reported on code.google.com by karl.ric...@gmail.com on 4 Jan 2015 at 11:03