[ESPResSo-devel] [bug #34775] Espresso shoud through a backgound error when properties of non-existing particles are queried

[Rudolf Weeber]

URL:
  <http://savannah.nongnu.org/bugs/?34775>

                 Summary: Espresso shoud through a backgound error when
properties of non-existing particles are queried
                 Project: ESPResSo
            Submitted by: rudolfweeber
            Submitted on: Tue 08 Nov 2011 10:54:13 AM CET
                Category: None
                Severity: 3 - Normal
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
           Fixed Release: None

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Details:

When querying the properties of a non-existing particle like
part 1 print pos
Es returns the string "na", which very likely results in a hard to debug error
later in the tcl script, when the value is used for calculation.
It would probably be better, if querying properties of non-existing particles
would result in a background error with meaningful message.
In addition, a command to theck for the existence of a particle could be
introduced like
if {[part 2 exists]}
...







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