Add note on empty pdf

1 files changed, 8 insertions, 4 deletions

diff --git a/html/whiteboard.js b/html/whiteboard.js
index 50b0058..07e3804 100644
--- a/html/whiteboard.js
+++ b/html/whiteboard.js
@@ -96,10 +96,14 @@ function on_version(version)
 
 function on_pdf(pdf)
 {
-        var a = document.getElementById("download-a");
-        a.href = "data:application/pdf;base64," + pdf;
-        a.download = get_id() + ".pdf"
-        a.click();
+  if (pdf == "") {
+    alert("Note: Empty PDF, not saving.");
+  } else {
+    var a = document.getElementById("download-a");
+    a.href = "data:application/pdf;base64," + pdf;
+    a.download = get_id() + ".pdf"
+    a.click();
+  }
 }
 
 function on_modify_ack(rev)