fix code path for missing runtime bytecode

Author: pipermerriam

populus/migrations/registrar.py

@@ -9,7 +9,7 @@
     normalize_contract_data,
 )
 from populus.utils.linking import (
-    link_bytecode,
+    link_bytecode_by_name,
 )
 
 
@@ -74,7 +74,7 @@ def get_contract_from_registrar(chain,
 
     contract_address = registrar.call().getAddress(registrar_key)
 
-    expected_runtime = link_bytecode(
+    expected_runtime = link_bytecode_by_name(
         contract_factory.code_runtime,
         **link_dependencies
     )

populus/utils/deploy.py

@@ -51,7 +51,11 @@ def deploy_contract(chain,
     web3 = chain.web3
 
     code = link_bytecode_by_name(contract_factory.code, **link_dependencies)
-    code_runtime = link_bytecode_by_name(contract_factory.code_runtime, **link_dependencies)
+
+    if contract_factory.code_runtime:
+        code_runtime = link_bytecode_by_name(contract_factory.code_runtime, **link_dependencies)
+    else:
+        code_runtime = None
 
     ContractFactory = web3.eth.contract(
         abi=contract_factory.abi,