Now generating a run_results.json even when no nodes are selected (#3315

)

* Now generating a run_results.json even when no nodes are selected.

* Typo in changelog

* Modified changelog in accordance with @jtcohen6's suggestions. Also fixed @TeddyCr's entry.

CHANGELOG.md

@@ -2,12 +2,14 @@
 
 ### Fixes
 - Fix compiled sql for ephemeral models ([#3317](https://github.com/fishtown-analytics/dbt/issues/3317), [#3318](https://github.com/fishtown-analytics/dbt/pull/3318))
+- Now generating `run_results.json` even when no nodes are selected ([#3313](https://github.com/fishtown-analytics/dbt/issues/3313), [#3315](https://github.com/fishtown-analytics/dbt/pull/3315))
 
 ### Under the hood
-- Added logic for registry requests to raise a timeout error after a response hangs out for 30 seconds and 5 attempts have been made to reach the endpoint ([#3117](https://github.com/fishtown-analytics/dbt/issues/3177))
+- Added logic for registry requests to raise a timeout error after a response hangs out for 30 seconds and 5 attempts have been made to reach the endpoint ([#3177](https://github.com/fishtown-analytics/dbt/issues/3177), [#3275](https://github.com/fishtown-analytics/dbt/pull/3275))
 
 Contributors:
-- [@TeddyCr](https://github.com/TeddyCr) ([#3117](https://github.com/fishtown-analytics/dbt/issues/3177))
+- [@TeddyCr](https://github.com/TeddyCr) ([#3275](https://github.com/fishtown-analytics/dbt/pull/3275))
+- [@panasenco](https://github.com/panasenco) ([#3315](https://github.com/fishtown-analytics/dbt/pull/3315))
 
 ## dbt 0.20.0b1 (May 03, 2021)
 

core/dbt/task/runnable.py

@@ -413,17 +413,16 @@ def run(self):
         if len(self._flattened_nodes) == 0:
             logger.warning("WARNING: Nothing to do. Try checking your model "
                            "configs and model specification args")
-            return self.get_result(
+            result = self.get_result(
                 results=[],
                 generated_at=datetime.utcnow(),
                 elapsed_time=0.0,
             )
         else:
             with TextOnly():
                 logger.info("")
-
-        selected_uids = frozenset(n.unique_id for n in self._flattened_nodes)
-        result = self.execute_with_hooks(selected_uids)
+            selected_uids = frozenset(n.unique_id for n in self._flattened_nodes)
+            result = self.execute_with_hooks(selected_uids)
 
         if flags.WRITE_JSON:
             self.write_manifest()