[Icons] Fix warning when Iconset license URL is null

Fix #1785

Author: smnandre

src/Icons/src/Command/ImportIconCommand.php

@@ -87,7 +87,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
                 " <fg=bright-green;options=bold>✓</> Imported <fg=bright-white;bg=black>%s:</><fg=bright-magenta;bg=black;options>%s</> (License: <href=%s>%s</>). Render with: <comment>{{ ux_icon('%s') }}</comment>",
                 $prefix,
                 $name,
-                $license['url'],
+                $license['url'] ?? '#',
                 $license['title'],
                 $fullName,
             ));

src/Icons/src/Command/LockIconsCommand.php

@@ -88,7 +88,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
                 " <fg=bright-green;options=bold>✓</> Imported <fg=bright-white;bg=black>%s:</><fg=bright-magenta;bg=black;options>%s</> (License: <href=%s>%s</>). Render with: <comment>{{ ux_icon('%s') }}</comment>",
                 $prefix,
                 $name,
-                $license['url'],
+                $license['url'] ?? '#',
                 $license['title'],
                 $icon,
             ));