build: set no-run-if-empty option for xargs

lib/node_modules/@stdlib/_tools/scripts/templates/workflow_productionize.yml.txt

@@ -283,7 +283,7 @@ jobs:
           find ./deno -type f -name '*.md' -print0 | xargs -0 sed -Ei "/\/tree\/main/b; /^\[@stdlib[^:]+: https:\/\/github.com\/stdlib-js\// s/(.*)/\\1\/tree\/deno/";
 
           # Replace reference to `@stdlib/types` with CDN link:
-          find ./deno -type f -name '*.ts' -print0 | xargs -0 sed -Ei "s/\/\/\/ <reference types=\"@stdlib\/types\"\/>/\/\/\/ <reference types=\"https:\/\/cdn.jsdelivr.net\/gh\/stdlib-js\/types@main\/index.d.ts\"\/>/g"
+          find ./deno -type f -name '*.ts' -print0 | xargs -0 -r sed -Ei "s/\/\/\/ <reference types=\"@stdlib\/types\"\/>/\/\/\/ <reference types=\"https:\/\/cdn.jsdelivr.net\/gh\/stdlib-js\/types@main\/index.d.ts\"\/>/g"
 
           # Change wording of project description to avoid reference to JavaScript and Node.js:
           find ./deno -type f -name '*.md' -print0 | xargs -0 sed -Ei "s/a standard library for JavaScript and Node.js, /a standard library /g"
@@ -634,7 +634,7 @@ jobs:
           find ./esm -type f -name '*.md' -print0 | xargs -0 sed -Ei "/\/tree\/main/b; /^\[@stdlib[^:]+: https:\/\/github.com\/stdlib-js\// s/(.*)/\\1\/tree\/esm/";
 
           # Replace reference to `@stdlib/types` with esm link:
-          find ./esm -type f -name '*.ts' -print0 | xargs -0 sed -Ei "s/\/\/\/ <reference types=\"@stdlib\/types\"\/>/\/\/\/ <reference types=\"https:\/\/cdn.jsdelivr.net\/gh\/stdlib-js\/types@esm\/index.d.ts\"\/>/g"
+          find ./esm -type f -name '*.ts' -print0 | xargs -0 -r sed -Ei "s/\/\/\/ <reference types=\"@stdlib\/types\"\/>/\/\/\/ <reference types=\"https:\/\/cdn.jsdelivr.net\/gh\/stdlib-js\/types@esm\/index.d.ts\"\/>/g"
 
           # Change wording of project description to avoid reference to JavaScript and Node.js:
           find ./esm -type f -name '*.md' -print0 | xargs -0 sed -Ei "s/a standard library for JavaScript and Node.js, /a standard library /g"