Fixed discid import when building docs

Author: phw

doc/conf.py

@@ -2,9 +2,6 @@
 import os
 import sys
 
-# to gather version information
-import discid
-
 sys.path.insert(0, os.path.abspath("."))  # for extensions
 sys.path.insert(0, os.path.abspath(".."))  # for the code
 
@@ -18,9 +15,15 @@ def __call__(self, *args):
     def __getattr__(cls, name):
         return Mock()
 
+    def discid_get_version_string(self):
+        return ""
+
 
 ctypes.cdll.LoadLibrary = Mock()  # type: ignore
 
+# to gather version information
+import discid  # noqa: E402
+
 # -- General configuration -----------------------------------------------------
 
 needs_sphinx = "1.0"