Remove corrupt KenLM model files.

perplexity_lenses/perplexity.py

@@ -7,7 +7,11 @@ import kenlm
 class KenlmModel:
     def __init__(self, language):
         download_kenlm_model(language)
-        self.model = kenlm.Model(f"{language}.arpa.bin")
+        try:
+            self.model = kenlm.Model(f"{language}.arpa.bin")
+        except OSError:
+            os.remove(f"{language}.arpa.bin")
+            raise OSError("File was corrupt and should have been removed. Please, retry.")
 
     @classmethod
     def from_pretrained(cls, language: str):