issues: 274161964

I get an exception clicking on the table link:

2017-11-15 08:40:10 - (sanic)[ERROR]: Traceback (most recent call last): File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/sanic/app.py", line 503, in handle_request response = await response File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/datasette/app.py", line 155, in get return await self.view_get(request, name, hash, **kwargs) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/datasette/app.py", line 219, in view_get **context, File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/sanic_jinja2/__init__.py", line 84, in render return html(self.render_string(template, request, **context)) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/sanic_jinja2/__init__.py", line 81, in render_string return self.env.get_template(template).render(**context) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/environment.py", line 812, in get_template return self._load_template(name, self.make_globals(globals)) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/environment.py", line 786, in _load_template template = self.loader.load(self, name, globals) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/loaders.py", line 125, in load code = environment.compile(source, name, filename) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/environment.py", line 565, in compile self.handle_exception(exc_info, source_hint=source_hint) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/environment.py", line 754, in handle_exception reraise(exc_type, exc_value, tb) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/_compat.py", line 37, in reraise raise value.with_traceback(tb) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/datasette/templates/table.html", line 29, in template <pre>params = {{ query.params|tojson(4) }}</pre> File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/environment.py", line 515, in _generate return generate(source, self, name, filename, defer_init=defer_init) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 62, in generate generator.visit(node) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/visitor.py", line 38, in visit return f(node, *args, **kwargs) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 849, in visit_Template self.blockvisit(block.body, block_frame) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 492, in blockvisit self.visit(node, frame) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/visitor.py", line 38, in visit return f(node, *args, **kwargs) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 1172, in visit_If self.blockvisit(node.body, if_frame) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 492, in blockvisit self.visit(node, frame) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/visitor.py", line 38, in visit return f(node, *args, **kwargs) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 1353, in visit_Output self.visit(argument, frame) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/visitor.py", line 38, in visit return f(node, *args, **kwargs) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 1565, in visit_Filter self.fail('no filter named %r' % node.name, node.lineno) File "/Users/e/anaconda3-4.2.0/lib/python3.5/site-packages/jinja2/compiler.py", line 427, in fail raise TemplateAssertionError(msg, lineno, self.name, self.filename) jinja2.exceptions.TemplateAssertionError: no filter named 'tojson'