Update src/witValidator.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: GordonSmith

src/witValidator.ts

@@ -37,7 +37,11 @@ export class WitSyntaxValidator {
             return null; // Validation succeeded
         } catch (error: unknown) {
             if (error && typeof error === "object" && "stack" in error) {
-                return extractErrorInfo(error.stack as string);
+                const errorInfo = extractErrorInfo(error.stack as string);
+                if (errorInfo === null) {
+                    throw new Error("Failed to parse error stack trace. Validation failed.");
+                }
+                return errorInfo;
             }
         }
         return null;