Refs #11418. Fix pylint warnings

Code/Mantid/Framework/PythonInterface/plugins/algorithms/PoldiLoadCrystalData.py

-# pylint: disable=no-init,invalid-name,bare-except
+# pylint: disable=no-init,invalid-name,too-few-public-methods
 from mantid.kernel import *
 from mantid.simpleapi import *
 from mantid.api import *
@@ -177,4 +177,4 @@ class PoldiLoadCrystalData(PythonAlgorithm):
         return compound.getName()
 
 
-AlgorithmFactory.subscribe(PoldiLoadCrystalData)
\ No newline at end of file
+AlgorithmFactory.subscribe(PoldiLoadCrystalData)