build: do not include unchanged packages in namespace changelogs

Author: Planeshifter

lib/node_modules/@stdlib/_tools/changelog/generate/lib/main.js

@@ -325,8 +325,8 @@ function generate( pkg, releaseType ) {
 		for ( i = 0; i < pkgNames.length; i++ ) {
 			name = pkgNames[ i ];
 			unreleased = releaseSummary( bySubpackage[ name ], true, true );
-			if ( unreleased || nextVersion ) {
-				str += packageSummaryWrapper( pkg, '', name, unreleased || PLACEHOLDER_SUMMARY );
+			if ( unreleased ) {
+				str += packageSummaryWrapper( pkg, '', name, unreleased );
 			}
 		}
 		str += sectionEnd( 'packages' );
@@ -359,10 +359,9 @@ function generate( pkg, releaseType ) {
 			for ( j = 0; j < pkgNames.length; j++ ) {
 				name = pkgNames[ j ];
 				summary = releaseSummary( bySubpackage[ name ], true, true );
-				if ( !summary ) {
-					summary = PLACEHOLDER_SUMMARY;
+				if ( summary ) {
+					str += packageSummaryWrapper( pkg, version, name, summary );
 				}
-				str += packageSummaryWrapper( pkg, version, name, summary );
 			}
 			str += sectionEnd( 'packages' );
 			str += breakingChanges( releaseCommits );