Fix observation table column width for columns with NA

CHANGELOG.md

@@ -44,6 +44,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- [[#739](https://github.com/nf-core/differentialabundance/pull/739)] - Fix issue in quarto report data overview table in cases of columns with NAs ([@grst](https://github.com/grst), review by [@pinin4fjords](https://github.com/pinin4fjords)))
 - [[#738](https://github.com/nf-core/differentialabundance/pull/738)] - Fix conda failing tests before release ([@atrigila](https://github.com/atrigila), review by [@mashehu](https://github.com/mashehu)).
 - [[#729](https://github.com/nf-core/differentialabundance/pull/729)] - Skip nf-schema path-existence validation for `igenomes_base` so launches succeed when the default `s3://ngi-igenomes/igenomes/` bucket is not reachable from the user's environment ([@pinin4fjords](https://github.com/pinin4fjords), review by [@atrigila](https://github.com/atrigila)).
 - [[#725](https://github.com/nf-core/differentialabundance/issues/725)] - Tighten `report_file` schema pattern to explicitly model the comma-separated multi-report form and validate each segment's extension ([@pinin4fjords](https://github.com/pinin4fjords), review by [@atrigila](https://github.com/atrigila)).

assets/differentialabundance_report.qmd

@@ -1365,7 +1365,7 @@ if (all(minimal_fetchngs_cols %in% colnames(observations))) {
     # Coerce per column rather than via apply (which flattens the frame to a
     # character matrix and silently drops any column containing an NA, because
     # max(nchar(NA)) is NA and `NA <= 20` is filtered out by `which`).
-    col_widths <- map_int(observations, \(x) max(nchar(as.character(x)), na.rm = TRUE))
+    col_widths <- map_int(observations, \(x) max(nchar(as.character(x)), 0L, na.rm = TRUE))
     additional_useful_cols <- names(col_widths)[col_widths <= 20]
 }