support no options

rolltable/tables.py

@@ -113,7 +113,7 @@ class RollTable:
                 freqs = random.choices(options, weights=weights, k=self.die)
                 values = []
                 for option in freqs:
-                    choice = random.choice(ds.data[option])
+                    choice = random.choice(ds.data[option]) if ds.data[option] else ''
                     if hasattr(choice, 'keys'):
                         c = [option]
                         for (k, v) in choice.items():

tests/test_tables.py

@@ -82,6 +82,16 @@ B3:
   - B choice 3
 """
 
+fixture_no_options = """
+metadata:
+    headers:
+        - headerA
+        - headerB
+B1:
+B2:
+B3:
+"""
+
 
 def test_combined_tables():
     combined = tables.RollTable([fixture_combined_A, fixture_combined_B], die=6)
@@ -125,5 +135,5 @@ def test_no_descriptions():
 
 
 def test_yaml():
-    t = tables.RollTable([fixture_metadata + fixture_source])
+    t = tables.RollTable([fixture_no_options])
     print(t.as_yaml)