Audit uses of ConstString::AsCString() to make sure they weren't assuming
they would always get a non-NULL string back.

<rdar://problem/19298575>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@224602 91177308-0d34-0410-b5e6-96231b3b80d8
Don't emit the "WARNING: no locations" message when breakpoints are set in
the dummy target.  Say they were set in the dummy target instead.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@224606 91177308-0d34-0410-b5e6-96231b3b80d8