add error if string was expected in list of passwords but dict was given.

happened to me:
_global:
   - user1: password1
   - user2: password2
instead of
_global:
   user1: password1
   user2: password2

Author: unverbuggt

README.md

@@ -31,7 +31,8 @@ The content is encrypted with AES-256 in Python using PyCryptodome, and decrypte
 * ~~Save the generated random keys instead of passwords to session( or local) storage~~
 * Sign generated generated and javascript files used in encrypted pages to make it more tamper proof
 * ~~Add check for latin1 encoding in passwords, as it pycryptodome's implementation of PBKDF2 requires it~~
-* 
+* find an equivalent way to define multiple passwords in the password inventory as global password
+* make it possible to define passwords in external yaml file(s)
 * ...to be defined
 
 # Table of Contents

encryptcontent/plugin.py

@@ -385,6 +385,9 @@ def on_config(self, config, **kwargs):
                 if isinstance(credentials, list):
                     new_entry['store'] = []
                     for password in credentials:
+                        if isinstance(password, dict):
+                            logger.error("Configuration error in yaml syntax of 'password_inventory': expected string at level '{level}', but found dict!".format(level=level))
+                            os._exit(1)
                         keystore = self.__encrypt_key__(new_entry['key'], password, self.setup['kdf_iterations'])
                         new_entry['store'].append(';'.join(keystore))
                 elif isinstance(credentials, dict):