Tests are crashing if no default device (#1311)

Author: antonwolfy

dpnp/backend/src/queue_sycl.hpp

@@ -137,6 +137,13 @@ class backend_sycl
 #else
         // temporal solution. Started from Sept-2020
         DPCTLSyclQueueRef DPCtrl_queue = DPCTLQueueMgr_GetCurrentQueue();
+        if (DPCtrl_queue == nullptr)
+        {
+            std::string reason = (DPCTLQueueMgr_GetQueueStackSize() == static_cast<size_t>(-1))
+                                     ? ": the queue stack is empty, probably no device is available."
+                                     : ".";
+            throw std::runtime_error("Failed to create a copy of SYCL queue with default device" + reason);
+        }
         return *(reinterpret_cast<sycl::queue*>(DPCtrl_queue));
 #endif
     }

dpnp/dpnp_algo/dpnp_algo.pxd

@@ -391,7 +391,7 @@ cdef extern from "constants.hpp":
 
 cdef extern from "dpnp_iface.hpp":
     void dpnp_queue_initialize_c(QueueOptions selector)
-    size_t dpnp_queue_is_cpu_c()
+    size_t dpnp_queue_is_cpu_c() except +
 
     char * dpnp_memory_alloc_c(size_t size_in_bytes) except +
     void dpnp_memory_free_c(void * ptr)