FIX Quicktests

Vectorisation test case was always set to avx which is problematic on machines not having avx.

pystencils_tests/test_vectorization.py

@@ -8,7 +8,10 @@ from pystencils.fast_approximation import insert_fast_sqrts, insert_fast_divisio
 from pystencils.transformations import replace_inner_stride_with_one
 
 supported_instruction_sets = get_supported_instruction_sets() if get_supported_instruction_sets() else []
-instruction_set = "avx" if "avx" in supported_instruction_sets else "sse"
+if supported_instruction_sets:
+    instruction_set = "avx" if "avx" in supported_instruction_sets else "sse"
+else:
+    instruction_set = None
 
 def test_vector_type_propagation():
     a, b, c, d, e = sp.symbols("a b c d e")