All "dedented" lines to be empty.

Eric Snow (ericsnowcurrently) · Jan 11, 2021 · Dec 17, 2020 · Jan 4, 2021 · Jan 4, 2021 · Jan 5, 2021
commit 34be2226d40ab36e4e44250d1253ab7f4d02d288
diff --git a/src/client/common/utils/text.ts b/src/client/common/utils/text.ts
@@ -139,6 +139,9 @@ export function getDedentedLines(text: string): string[] {
         throw Error('expected actual first line to be blank');
     }
     lines.shift();
+    if (lines.length === 0) {
+        return [];
+    }
 
     if (lines[0] === '') {
         throw Error('expected "first" line to not be blank');