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-rw-r--r--gr-blocks/grc/blocks_throttle.block.yml1
1 files changed, 1 insertions, 0 deletions
diff --git a/gr-blocks/grc/blocks_throttle.block.yml b/gr-blocks/grc/blocks_throttle.block.yml
index ae31a9be2b..894091156a 100644
--- a/gr-blocks/grc/blocks_throttle.block.yml
+++ b/gr-blocks/grc/blocks_throttle.block.yml
@@ -35,6 +35,7 @@ outputs:
- domain: stream
dtype: ${ type }
vlen: ${ vlen }
+ optional: true
asserts:
- ${ vlen > 0 }