fix: lazysecrets list keeps each entry on one line, errors to their first

internal/listing/listing.go

@@ -312,10 +312,22 @@ func (r result) failed() Entry {
 	default:
 		e = Entry{Kind: "source", Provider: kindOf(r.p.Kind()), Path: []string{r.p.Label()}}
 	}
-	e.Error = r.err.Error()
+	e.Error = firstLine(r.err.Error())
 	return e
 }
 
+// firstLine is an error's first line, the summary (Azure's go on with
+// the caller's IDs and more): an entry is one line. Tabs, which would
+// split it into columns, are spaces.
+func firstLine(s string) string {
+	for line := range strings.Lines(s) {
+		if line = strings.TrimSpace(line); line != "" {
+			return strings.ReplaceAll(line, "\t", " ")
+		}
+	}
+	return "unreadable"
+}
+
 func kindOf(k provider.Kind) string { return strings.ToLower(string(k)) }
 
 // accountOf is the account part of a source's provider label ("alice" in