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hugolib: Recover and log panics in content init

See #6210

--- a/hugolib/page__per_output.go

+++ b/hugolib/page__per_output.go

@@ -18,6 +18,7 @@

 	"context"

 	"fmt"

 	"html/template"

+	"runtime/debug"

 	"strings"

 	"sync"

 	"unicode/utf8"

@@ -65,8 +66,15 @@

 			f: f,

 		}

-		initContent := func() error {

-			var err error

+		initContent := func() (err error) {

+			defer func() {

+				// See https://github.com/gohugoio/hugo/issues/6210

+				if r := recover(); r != nil {

+					err = fmt.Errorf("%s", r)

+					p.s.Log.ERROR.Println("[BUG] Got panic:\n", string(debug.Stack()))

+				}

+			}()

+

 			var hasVariants bool

 			cp.contentPlaceholders, hasVariants, err = p.shortcodeState.renderShortcodesForPage(p, f)