Tolerate config files without outputs

CHANGELOG.md

@@ -6,7 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 ## [Unreleased]
-
+### Added
+- Tolerate config files without outputs
 
 ## [0.2.4] - 2020-05-19
 ### Changed

kiplot/config_reader.py

@@ -574,9 +574,11 @@ class CfgYamlReader(CfgReader):
         if 'preflight' in data:
             self._parse_preflight(data['preflight'], cfg)
 
-        for o in data['outputs']:
-
-            op_cfg = self._parse_output(o)
-            cfg.add_output(op_cfg)
+        try:
+            for o in data['outputs']:
+                op_cfg = self._parse_output(o)
+                cfg.add_output(op_cfg)
+        except KeyError:
+            pass
 
         return cfg