A source map whose `sources` contains `""` (a legal relative reference,
emitted for virtual or generated modules) made the whole application
analysis fail: the empty name became the `source-map-original` identity's
`original_source`, which must be nonempty. Display it as `""` at the same
accumulator seam; the observation's `properties.source` keeps the exact
empty name.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A single legal empty literal such as `fetch('')`, `require('')`,
`bus.on('', f)`, `localStorage.getItem('')`, or `ipcMain.handle('', f)`
made the whole application analysis fail with `unreadable_output`: the
literal became an application-graph observation label, an artifact-local
identity key, or a semantic node label, all of which must be nonempty.
Normalize display at the two graph construction seams instead of at each
producer: `JavaScriptArtifactGraphAccumulator.addNode` and
`constructSemanticGraphNode` show the empty value as `""` via a shared
`javascriptDisplayText` helper. Observation and node properties keep the
exact empty value. This replaces the per-site `semanticNameLabel` calls.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
