[Python] How to avoid AttributeError in multiple labels

I have dicom files from different sources and sometimes i get error like this:

AttributeError: 'FileDataset' object has no attribute 'PatientAge' because some files doesn't have this attribute.
​

I've created function to check objects for errors:

def check_if_exists(self, object_attr):
try:
return str(object_attr)
except:
return 'NULL'


But I get error in setText line before executing code from my function:

self.label.setText(self.check_if_exists(ds.PatientAge))


I have several labels like this so I wanted to create one function and check if each attribute exists but I'm not sure how to do this. Sometimes I use ds.PatientName, ds.PatientAge and sometimes ds[0x0022,0x7031].value. Using try except: or hasattr() function for each label is redundant and i'm trying to get the best solution.

Can you give me some ideas?

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