[cherry-pick][stable/20230725] [LLDB] Fix crash when using tab completion on class variables #8350
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We weren't checking to see if the partial_path was empty before adding
completions and this led to crashes when the class object and a variable
both start with the same substring.
(cherry picked from commit
de5518836e16be3fbfce78394adc96d9bf70f2a5
)