raaaar
diff --git a/‎rules_python/piptool.py
Lines changed: 5 additions & 3 deletions b/‎rules_python/piptool.py
Lines changed: 5 additions & 3 deletions
diff --git a/‎tools/piptool.par
123 Bytes b/‎tools/piptool.par
123 Bytes
@@ -165,10 +165,12 @@ def pip_install():
 all_requirements = _requirements.values()
 
 def requirement(name):
-  name = name.replace("-", "_").lower()
-  return _requirements[name]
+  name_key = name.replace("-", "_").lower()
+  if name_key not in _requirements:
+    fail("Could not find pip-provided dependency: '%s'" % name)
+  return _requirements[name_key]
 """.format(input=args.input,
-           whl_libraries='\n'.join(map(whl_library, whls)),
+           whl_libraries='\n'.join(map(whl_library, whls)) if whls else "pass",
            mappings=','.join([
              '"%s": "@%s//:pkg"' % (wheel.distribution().lower(), wheel.repository_name())
              for wheel in whls