🐛 Catch TypeError from from_plugin_classname

This fixes issue #269.
Previously we showed an unhelpful stack trace.

Author: KevinHock

detect_secrets/plugins/common/initialize.py

@@ -165,7 +165,12 @@ def from_plugin_classname(
     try:
         klass = import_plugins()[plugin_classname]
     except KeyError:
-        log.warning('No such plugin to initialize.')
+        log.error('Error: No such `{}` plugin to initialize.'.format(plugin_classname))
+        log.error('Chances are you should run `pre-commit autoupdate`.')
+        log.error(
+            'This error occurs when using a baseline that was made by '
+            'a newer detect-secrets version than the one running.',
+        )
         raise TypeError
 
     try:

detect_secrets/pre_commit_hook.py

@@ -32,7 +32,7 @@ def main(argv=None):
         # If baseline is provided, we first want to make sure
         # it's valid, before doing any further computation.
         baseline_collection = get_baseline(args.baseline[0])
-    except (IOError, ValueError):
+    except (IOError, TypeError, ValueError):
         # Error logs handled within logic.
         return 1