fix a bug after my NSC rules update

Author: AnastaZIuk

cmake/common.cmake

@@ -1427,15 +1427,18 @@ namespace @IMPL_NAMESPACE@ {
 ]=])
 		unset(RETVAL_EVAL)
 		list(LENGTH CAP_NAMES CAP_COUNT)
-		math(EXPR CAP_COUNT "${CAP_COUNT} - 1")
-		foreach(i RANGE ${CAP_COUNT})
-		list(GET CAP_NAMES ${i} CAP)
-		list(GET CAP_KINDS ${i} KIND)
-			string(CONFIGURE [=[
+		if(CAP_COUNT GREATER 0)
+			math(EXPR LAST_CAP "${CAP_COUNT} - 1")
+			foreach(i RANGE ${LAST_CAP})
+				list(GET CAP_NAMES ${i} CAP)
+				list(GET CAP_KINDS ${i} KIND)
+				string(CONFIGURE [=[
 		retval += ".@CAP@_" + std::to_string(@KIND@.@CAP@);
-]=] RETVALUE_VIEW @ONLY)
-			string(APPEND RETVAL_EVAL "${RETVALUE_VIEW}")
-		endforeach()
+]=] 			RETVALUE_VIEW @ONLY)
+				string(APPEND RETVAL_EVAL "${RETVALUE_VIEW}")
+			endforeach()
+		endif()
+		
 		string(CONFIGURE "${HEADER_ITEM_VIEW}" HEADER_ITEM_EVAL @ONLY)
 		set_property(TARGET ${IMPL_TARGET} APPEND_STRING PROPERTY NBL_HEADER_CONTENT "${HEADER_ITEM_EVAL}")