ci: fix cmake when CMAKE_BUILD_TYPE is empty string

Author: Acly

CMakeLists.txt

@@ -16,11 +16,14 @@ if(PROJECT_IS_TOP_LEVEL)
   set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 endif()
 
-if(VISP_DEV OR ${CMAKE_BUILD_TYPE} STREQUAL "Debug")
+if(VISP_DEV)
   set(VISP_ASSERT "VISP_ASSERT_BREAK")
-endif()
-if(${CMAKE_BUILD_TYPE} STREQUAL "Release")
-  set(VISP_ASSERT "VISP_ASSERT_DISABLE")
+elseif(CMAKE_BUILD_TYPE)
+  if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
+    set(VISP_ASSERT "VISP_ASSERT_BREAK")
+  elseif(${CMAKE_BUILD_TYPE} STREQUAL "Release")
+    set(VISP_ASSERT "VISP_ASSERT_DISABLE")
+  endif()
 endif()
 
 if(VISP_ASAN)