fix crash that occurs in write_log when user interrupts generation with ^C

ldm/dream/args.py

@@ -81,7 +81,7 @@ with metadata_from_png():
 """
 
 import argparse
-from argparse import Namespace
+from argparse import Namespace, RawTextHelpFormatter
 import shlex
 import json
 import hashlib
@@ -463,7 +463,9 @@ class Args(object):
     # This creates the parser that processes commands on the dream> command line
     def _create_dream_cmd_parser(self):
         parser = argparse.ArgumentParser(
-            description="""
+            formatter_class=RawTextHelpFormatter,
+            description=
+            """
             *Image generation:*
             To generate images, type a text prompt with optional switches. Example:
                  a fantastic alien landscape -W576 -H512 -s60 -n4

ldm/dream/log.py

@@ -22,6 +22,8 @@ def write_log(results, log_path, file_types, output_cntr):
 
 def write_log_message(results, output_cntr):
     """logs to the terminal"""
+    if len(results) == 0:
+        return output_cntr
     log_lines = [f"{path}: {prompt}\n" for path, prompt in results]
     if len(log_lines)>1:
         subcntr = 1