chore(CMake): make KDReports optional for LtsPrinting to allow configure without printing deps

Lts/Common/LtsPrinting/CMakeLists.txt

@@ -6,7 +6,7 @@
 # Created by Christian Ehrlicher, SLSE, 2017-12-05
 #
 
-FIND_PACKAGE(KDReports REQUIRED)
+FIND_PACKAGE(KDReports)
 
 SET(SRCS
   printing_base.cpp
@@ -15,7 +15,7 @@ SET(SRCS
   printing.h
 )
 
-
+if (KDReports_FOUND)
   NGL_ADD_LIBRARY(WS LtsPrinting SHARED ${SRCS})
   NGL_TARGET_INCLUDE_DIRECTORIES(LtsPrinting
     PUBLIC
@@ -33,3 +33,6 @@ NGL_TARGET_LINK_LIBRARIES(LtsPrinting
       Qt5::Core
   )
   NGL_INSTALL_TARGET(LtsPrinting)
+else()
+  message(STATUS "KDReports not found; skipping LtsPrinting target")
+endif()