(numba/dppy) Added check to not error out if OpenCL is absent

Author: reazulhoque

__init__.py

@@ -5,11 +5,15 @@
 
 from numba import config
 import numba.testing
-from dppy.ocldrv import *
-from .device_init import *
+
+from numba.dppy_config import *
+if dppy_present:
+    from .device_init import *
+else:
+    raise ImportError("Importing dppy failed")
 
 def test(*args, **kwargs):
-    if not is_available():
+    if dppy_present and not is_available():
         dppy_error()
 
     return numba.testing.test("numba.dppy.tests", *args, **kwargs)

tests/__init__.py

@@ -1,14 +1,16 @@
 from numba.testing import SerialSuite
 from numba.testing import load_testsuite
 from os.path import dirname, join
-import dppy.ocldrv as ocldrv
+
+
+import numba.dppy_config as dppy_config
 
 def load_tests(loader, tests, pattern):
 
     suite = SerialSuite()
     this_dir = dirname(__file__)
 
-    if ocldrv.is_available():
+    if dppy_config.dppy_present and dppy_config.is_available():
         suite.addTests(load_testsuite(loader, join(this_dir, 'dppy')))
     else:
         print("skipped DPPY tests")