diff --git a/pandora/archive/extract.py b/pandora/archive/extract.py
index 1c952ffe..8fa9360c 100644
--- a/pandora/archive/extract.py
+++ b/pandora/archive/extract.py
@@ -317,9 +317,10 @@ def average_color(prefix, start=0, end=0):
 
     if end:
         frames = end - start
-    for i in range(0, len(pixels)):
-        p = np.sum(pixels[i], axis=0) / frames
-        color += p
+    if frames:
+        for i in range(0, len(pixels)):
+            p = np.sum(pixels[i], axis=0) / frames
+            color += p
     color = list(map(float, color))
     return ox.image.getHSL(color)
 
diff --git a/pandora/clip/managers.py b/pandora/clip/managers.py
index eae7e1f2..82b02dec 100644
--- a/pandora/clip/managers.py
+++ b/pandora/clip/managers.py
@@ -59,6 +59,9 @@ def parseCondition(condition, user):
             return ~q
         else:
             return q
+    if (not exclude and op == '=' or op in ('$', '^', '>=', '<')) and v == '':
+        return Q(True)
+
     if k.endswith('__id'):
         v = decode_id(v)
     if isinstance(v, bool): #featured and public flag