fix: accept empty script blocks with spaces

Signed-off-by: Andres Correa Casablanca <andreu@kindspells.dev>

Author: castarco

@kindspells/astro-shield/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@kindspells/astro-shield",
-	"version": "1.7.0",
+	"version": "1.7.1",
 	"description": "Astro integration to enhance your website's security with SubResource Integrity hashes, Content-Security-Policy headers, and other techniques.",
 	"private": false,
 	"type": "module",

@kindspells/astro-shield/src/core.mts

@@ -175,7 +175,10 @@ export const updateStaticPageSriHashes = async (
 		// biome-ignore lint/suspicious/noAssignInExpressions: safe
 		while ((match = regex.exec(content)) !== null) {
 			const attrs = match.groups?.attrs?.trim() ?? ''
-			const elemContent = match.groups?.content ?? ''
+
+			// We trim elemContent ONLY if it's made out of 100% whitespace characters
+			const _elemContent = match.groups?.content ?? ''
+			const elemContent = _elemContent.trim() === '' ? '' : _elemContent
 
 			let sriHash: string | undefined = undefined
 			let setCrossorigin = false
@@ -320,7 +323,10 @@ export const updateDynamicPageSriHashes = (
 		// biome-ignore lint/suspicious/noAssignInExpressions: safe
 		while ((match = regex.exec(content)) !== null) {
 			const attrs = match.groups?.attrs?.trim() ?? ''
-			const elemContent = match.groups?.content ?? ''
+
+			// We trim elemContent ONLY if it's made out of 100% whitespace characters
+			const _elemContent = match.groups?.content ?? ''
+			const elemContent = _elemContent.trim() === '' ? '' : _elemContent
 
 			let sriHash: string | undefined = undefined
 			let setCrossorigin = false