[1.5.x] Change exception type to reduce confusion.

TemplateSyntaxError is expected at compile time, not at run time.

Refs #19280.

Backport of 7644800.

django/template/defaulttags.py

@@ -399,8 +399,8 @@ def render(self, context):
         view_name = self.view_name.resolve(context)
 
         if not view_name:
-            raise TemplateSyntaxError("'url' takes requires a non-empty first"
-                " argument. The syntax changed in Django 1.5, see the docs.")
+            raise NoReverseMatch("'url' requires a non-empty first argument. "
+                "The syntax changed in Django 1.5, see the docs.")
 
         # Try to look up the URL twice: once given the view name, and again
         # relative to what we guess is the "main" app. If they both fail,

tests/regressiontests/templates/tests.py

@@ -20,7 +20,7 @@
 
 from django import template
 from django.template import (base as template_base, Context, RequestContext,
-    Template, TemplateSyntaxError)
+    Template)
 from django.core import urlresolvers
 from django.template import loader
 from django.template.loaders import app_directories, filesystem, cached
@@ -369,7 +369,7 @@ def test_url_explicit_exception_for_old_syntax(self):
         # Regression test for #19280
         t = Template('{% url path.to.view %}')      # not quoted = old syntax
         c = Context()
-        with self.assertRaisesRegexp(TemplateSyntaxError,
+        with self.assertRaisesRegexp(urlresolvers.NoReverseMatch,
                 "The syntax changed in Django 1.5, see the docs."):
             t.render(c)