5 files changed, 5 insertions, 0 deletions
diff --git a/debug_toolbar/panels/__init__.py b/debug_toolbar/panels/__init__.py
index c4a9f48..29cec02 100644
--- a/debug_toolbar/panels/__init__.py
+++ b/debug_toolbar/panels/__init__.py
@@ -5,6 +5,7 @@ class DebugPanel(object):
     Base class for debug panels.
     """
     # name = Base
+    has_content = False # If content returns something, set to true in subclass
     
     def __init__(self, request):
         self.request = request
diff --git a/debug_toolbar/panels/cache.py b/debug_toolbar/panels/cache.py
index fa6bdd0..263b62b 100644
--- a/debug_toolbar/panels/cache.py
+++ b/debug_toolbar/panels/cache.py
@@ -76,6 +76,7 @@ class CacheDebugPanel(DebugPanel):
     Panel that displays the cache statistics.
     """
     name = 'Cache'
+    has_content = True
 
     def __init__(self, request):
         # This is hackish but to prevent threading issues is somewhat needed
diff --git a/debug_toolbar/panels/headers.py b/debug_toolbar/panels/headers.py
index d75cb25..3ab4a95 100644
--- a/debug_toolbar/panels/headers.py
+++ b/debug_toolbar/panels/headers.py
@@ -6,6 +6,7 @@ class HeaderDebugPanel(DebugPanel):
     A panel to display HTTP headers.
     """
     name = 'Header'
+    has_content = True
     # List of headers we want to display
     header_filter = (
         'CONTENT_TYPE',
diff --git a/debug_toolbar/panels/request_vars.py b/debug_toolbar/panels/request_vars.py
index 9f1a30d..a137393 100644
--- a/debug_toolbar/panels/request_vars.py
+++ b/debug_toolbar/panels/request_vars.py
@@ -6,6 +6,7 @@ class RequestVarsDebugPanel(DebugPanel):
     A panel to display request variables (POST/GET, session, cookies).
     """
     name = 'RequestVars'
+    has_content = True
 
     def title(self):
         return 'Request Vars'
diff --git a/debug_toolbar/panels/sql.py b/debug_toolbar/panels/sql.py
index 2ca50ed..0a95533 100644
--- a/debug_toolbar/panels/sql.py
+++ b/debug_toolbar/panels/sql.py
@@ -29,6 +29,7 @@ class SQLDebugPanel(DebugPanel):
     Panel that displays information about the SQL queries run while processing the request.
     """
     name = 'SQL'
+    has_content = True
     
     def title(self):
         total_time = sum(map(lambda q: float(q['time']) * 1000, connection.queries))