Fix bare except clauses: use specific exception types

[koteshyelamati]

Fix bare except: clauses that catch BaseException (including SystemExit and KeyboardInterrupt). Replace with specific exception types:

• memory_profiler.py: except: → except (ValueError, IndexError): — the try block parses float(out[1].split()[vsz_index]) / 1024, which can raise ValueError (bad float) or IndexError (missing field)
• mprof.py (line ~251): except: → except Exception: — wraps proc.cmdline() which can raise various psutil exceptions
• mprof.py (line ~759): except: → except (ValueError, AttributeError): — the try block calls float(x) (raises ValueError) and value.split(',') (raises AttributeError if not a string)

Using bare except: is unsafe because it silences KeyboardInterrupt and SystemExit, making the program unresponsive to Ctrl+C or interpreter shutdown.