[infrastructure] add external null-annotations (#8848)

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>
2020-10-31 00:29:03 +01:00
parent 47d05055db
commit bd664ff0c8
162 changed files with 933 additions and 575 deletions
--- a/bundles/org.openhab.binding.plclogo/src/main/java/org/openhab/binding/plclogo/internal/handler/PLCCommonHandler.java
+++ b/bundles/org.openhab.binding.plclogo/src/main/java/org/openhab/binding/plclogo/internal/handler/PLCCommonHandler.java
@@ -280,6 +280,10 @@ public abstract class PLCCommonHandler extends BaseThingHandler {
    }

    protected static String getBlockFromChannel(final @Nullable Channel channel) {
-        return channel == null ? NOT_SUPPORTED : channel.getProperties().get(BLOCK_PROPERTY);
+        if (channel == null) {
+            return NOT_SUPPORTED;
+        }
+        String block = channel.getProperties().get(BLOCK_PROPERTY);
+        return block == null ? NOT_SUPPORTED : block;
    }
 }