Is there a more Pythonic way to combine an Else: statement and an Except:?

Use dict.get() which will return the value associated with the given key if it exists otherwise None. (Note that '' and None are both falsey values.) If s is true then assign it to nObject.TextString otherwise give it a value of "N/A".

if nObject.TextString == "overall_weight":
    nObject.TextString = self.var.jobDetails.get("Overall Weight") or "N/A"