Correctly handle non existant path in QUARTO_CHROMIUM

Author: cderv

src/command/check/check.ts

@@ -449,6 +449,12 @@ async function checkInstall(conf: CheckConfiguration) {
     const chromiumQuarto = chromiumTool && await chromiumTool.installed()
       ? chromiumTool
       : undefined;
+    if (envPath && !safeExistsSync(envPath)) {
+      chromeHeadlessOutput.push(
+        `${kIndent}NOTE: QUARTO_CHROMIUM is set to ${envPath} but the path does not exist.`,
+      );
+      chromeJson["QUARTO_CHROMIUM_invalid"] = envPath;
+    }
     if (envPath && safeExistsSync(envPath)) {
       chromeHeadlessOutput.push(`${kIndent}Using: Chrome from QUARTO_CHROMIUM`);
       chromeHeadlessOutput.push(`${kIndent}Path: ${envPath}`);

src/core/puppeteer.ts

@@ -282,9 +282,13 @@ export async function getBrowserExecutablePath() {
 
   // Priority 1: QUARTO_CHROMIUM env var
   const envPath = Deno.env.get("QUARTO_CHROMIUM");
-  if (envPath && safeExistsSync(envPath)) {
-    debug(`[CHROMIUM] Using QUARTO_CHROMIUM: ${envPath}`);
-    executablePath = envPath;
+  if (envPath) {
+    if (safeExistsSync(envPath)) {
+      debug(`[CHROMIUM] Using QUARTO_CHROMIUM: ${envPath}`);
+      executablePath = envPath;
+    } else {
+      debug(`[CHROMIUM] QUARTO_CHROMIUM is set to ${envPath} but the path does not exist. Searching for another browser.`);
+    }
   }
 
   // Priority 2: Quarto-installed chrome-headless-shell