fix: code intel on diffs with newly added files

Author: attfarhan

src/libs/github/dom_functions.ts

@@ -202,8 +202,10 @@ export const getDiffLineRanges: CodeView['getLineRanges'] = (codeView, part) =>
         if (isCode) {
             const line = row.querySelector<HTMLElement>(
                 `td${isDomSplitDiff() ? `:nth-of-type(${part === 'base' ? 2 : 4})` : '.blob-code'}`
-            )!
+            )
+
             if (
+                !line ||
                 line.classList.contains('empty-cell') ||
                 line.classList.contains(part === 'base' ? 'blob-code-addition' : 'blob-code-deletion')
             ) {