Add link to RTD, actually exit on error

data/lm/generate_package.py

@@ -3,6 +3,7 @@ from __future__ import absolute_import, division, print_function
 
 import argparse
 import shutil
+import sys
 
 import ds_ctcdecoder
 from deepspeech_training.util.text import Alphabet, UTF8Alphabet
@@ -56,6 +57,8 @@ def create_bundle(
     err = scorer.load_lm(lm_path)
     if err != ds_ctcdecoder.DS_ERR_SCORER_NO_TRIE:
         print('Error loading language model file: 0x{:X}.'.format(err))
+        print('See the error codes section in https://deepspeech.readthedocs.io for a description.')
+        sys.exit(1)
     scorer.fill_dictionary(list(words))
     shutil.copy(lm_path, package_path)
     scorer.save_dictionary(package_path, True)  # append, not overwrite