make select not fail on sidecar without HED key pair

changelog.d/20260122_164126_28850131+bendhouseart_hed_read_error.md

@@ -0,0 +1,46 @@
+<!--
+A new scriv changelog fragment.
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+Uncomment the section that is right (remove the HTML comment wrapper).
+-->
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+<!--
+### Added
+
+- A bullet item for the Added category.
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+<!--
+### Changed
+
+- A bullet item for the Changed category.
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+-->
+### Fixed
+
+- Prevent HED check from failing for null values found in sidecar metadata.
+
+<!--
+### Deprecated
+
+- A bullet item for the Deprecated category.
+
+-->
+<!--
+### Removed
+
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+### Security
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+### Infrastructure
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+-->

src/validators/hed.ts

@@ -13,7 +13,7 @@ function sidecarHasHed(sidecarData: BIDSContext['sidecar']): boolean {
 }
 
 function sidecarValueHasHed(sidecarValue: { HED?: string }): boolean {
-  return typeof sidecarValue.HED !== 'undefined'
+  return typeof sidecarValue?.HED !== 'undefined'
 }
 
 async function setHedSchemas(dataset: BIDSContextDataset): Promise<HedIssue[]> {