alwaysProvidesOrientation Patch and Test (#300)

* 'alwaysProvidesOrientation Patch and Test

* Modified warning message.

src/scenic/syntax/veneer.py

@@ -249,6 +249,7 @@
 import sys
 import traceback
 import typing
+import warnings
 
 from scenic.core.distributions import (
     Distribution,
@@ -1521,6 +1522,11 @@ def alwaysProvidesOrientation(region):
             return sample.orientation is not None or sample is nowhere
         except RejectionException:
             return False
+        except Exception as e:
+            warnings.warn(
+                f"While sampling internally to determine if a random region provides an orientation, the following exception was raised: {repr(e)}"
+            )
+            return False
 
 
 def OffsetBy(offset):

tests/syntax/test_specifiers.py

@@ -1198,3 +1198,19 @@ def test_color():
             ego = new Object with color (1,1,1,1,1)
             """
         sampleEgoFrom(program)
+
+
+# alwaysProvidesOrientation
+def test_alwaysProvidesOrientation_exception():
+    with pytest.warns(UserWarning):
+        compileScenic(
+            """
+            from scenic.core.distributions import distributionFunction
+
+            @distributionFunction
+            def foo(bar):
+                assert False
+
+            new Object in foo(Range(0,1))
+            """
+        )