Handle parse exceptions carefully on checking sslmng output

In some cases sslmng output could skip parameters for specific services.
Usually it happens when ssl related parameters was not specifically
changed for a service. This situation is fine, so we should just
skip the DH parameters increase action in this case.

pleskdistup/actions/emails.py

@@ -32,6 +32,12 @@ def _is_required(self) -> bool:
         except json.JSONDecodeError:
             log.warn(f"Failed to parse plesk sslmng results: {proc.stdout}")
             return False
+        except KeyError as e:
+            log.warn(f"There is no parameter '{e}' in the sslmng output.")
+            return False
+        except Exception as e:
+            log.warn(f"Failed to check sslmng configuration for dovecot: {e}. Type is {type(e)}")
+            raise e
 
         return True