expection: fix non-nullable return

Author: krichprollsch

src/browser/page.zig

@@ -642,9 +642,10 @@ pub const Page = struct {
                     switch (try page.scope.module(body, src)) {
                         .value => |v| break :blk v,
                         .exception => |e| {
-                            if (try e.exception(page.arena)) |msg| {
-                                log.info("eval module {s}: {s}", .{ src, msg });
-                            }
+                            log.info("eval module {s}: {s}", .{
+                                src,
+                                try e.exception(page.arena),
+                            });
                             return error.JsErr;
                         },
                     }

src/runtime/js.zig

@@ -1147,7 +1147,7 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
             scope: *const Scope,
 
             // the caller needs to deinit the string returned
-            pub fn exception(self: Exception, allocator: Allocator) !?[]const u8 {
+            pub fn exception(self: Exception, allocator: Allocator) ![]const u8 {
                 const scope = self.scope;
                 return try valueToString(allocator, self.inner, scope.isolate, scope.context);
             }