Added a check to parameterized which raises a ValueError when the input iterable is empty, this is probably due to some programmer error and means that no tests are run when this was probably not intended

parameterized/parameterized.py

diff --git a/parameterized/parameterized.py b/parameterized/parameterized.py
index 1d83404..96843f2 100644
--- a/parameterized/parameterized.py
+++ b/parameterized/parameterized.py
@@ -320,9 +320,15 @@
                     if test_self is not None:
                         delattr(test_cls, test_func.__name__)
                     wrapper.__doc__ = original_doc
+
         wrapper.parameterized_input = self.get_input()
+
+        if not wrapper.parameterized_input:
+            raise ValueError('Parameters iterable was empty')
+
         wrapper.parameterized_func = test_func
         test_func.__name__ = "_parameterized_original_%s" %(test_func.__name__, )
+
         return wrapper
 
     def param_as_nose_tuple(self, test_self, func, num, p):

parameterized/test.py

diff --git a/parameterized/test.py b/parameterized/test.py
index d5bcd8f..ef6bf03 100644
--- a/parameterized/test.py
+++ b/parameterized/test.py
@@ -214,6 +214,16 @@
     else:
         raise AssertionError("Expected exception not raised")
 
+
+def test_helpful_error_on_empty_iterable_input():
+    try:
+        parameterized([])(lambda: None)
+    except ValueError as e:
+        assert_contains(str(e), "Parameters iterable was empty")
+    else:
+        raise AssertionError("Expected exception not raised")
+
+
 expect("generator", [
     "test_wrapped_iterable_input('foo')",
 ])