Tcl: Return directly after contract retrieval

Before this update the `tcl` plugin would report that it was unable to
read the configuration file, if the `KeySet` managed by the plugin was
empty.

doc/news/_preparation_next_release.md

@@ -100,6 +100,11 @@ Thanks to Armin Wurzinger.
   commonly used specification keywords to be used with the [typechecker](https://www.libelektra.org/plugins/typechecker). Currently the
   keywords `check/range`, `check/enum` and `check/validation` are supported. *(Armin Wurzinger)*
 
+### Tcl
+
+- The [`tcl`](http://libelektra.org/plugins/tcl) plugin does not fail anymore, if its configuration file does not exist and you try to
+  retrieve the plugin contract. *(René Schwaiger)*
+
 ### Misc
 
 - The logging plugins ["syslog"](https://www.libelektra.org/plugins/syslog),

src/plugins/tcl/tcl.cpp

@@ -42,6 +42,7 @@ int elektraTclGet (Plugin *, KeySet * returned, Key * parentKey)
 #include "readme_tcl.c"
 				     keyNew ("system/elektra/modules/tcl/infos/version", KEY_VALUE, PLUGINVERSION, KEY_END), KS_END));
 		ksDel (n);
+		return ELEKTRA_PLUGIN_STATUS_SUCCESS;
 	}
 	/* get all keys */