Tweak exception handling in run.py

Modify exception handling such that when NaN values are encountered in TSV supporting data files, the simple payback and internal rate of return calculations yield 999 values instead of failing with a LinAlgError exception.

Author: handichan

run.py

@@ -1102,7 +1102,7 @@ def metric_update(self, m, life_base, life_meas, scost_base,
             irr_e = npf.irr(cashflows_s_delt + cashflows_e_delt)
             if not math.isfinite(irr_e):
                 raise (ValueError)
-        except ValueError:
+        except (ValueError, LinAlgError):
             irr_e = 999
         try:
             payback_e = self.payback(cashflows_s_delt + cashflows_e_delt)
@@ -1114,7 +1114,7 @@ def metric_update(self, m, life_base, life_meas, scost_base,
                 cashflows_s_delt + cashflows_e_delt + cashflows_c_delt)
             if not math.isfinite(irr_ec):
                 raise (ValueError)
-        except ValueError:
+        except (ValueError, LinAlgError):
             irr_ec = 999
         try:
             payback_ec = \