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
@@ -15,21 +15,24 @@ SET(SRCS
   printing.h
 )
 
-
-NGL_ADD_LIBRARY(WS LtsPrinting SHARED ${SRCS})
-NGL_TARGET_INCLUDE_DIRECTORIES(LtsPrinting
-  PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/../
-)
-NGL_TARGET_LINK_LIBRARIES(LtsPrinting
-  PRIVATE
-    KDReports::KDReports
-    LtsSessionData
-    LtsSession
-    nglsettings
-    ngltools
-  PUBLIC
-    Qt5::PrintSupport
-    Qt5::Core
-)
-NGL_INSTALL_TARGET(LtsPrinting)
+if (KDReports_FOUND)
+  NGL_ADD_LIBRARY(WS LtsPrinting SHARED ${SRCS})
+  NGL_TARGET_INCLUDE_DIRECTORIES(LtsPrinting
+    PUBLIC
+      ${CMAKE_CURRENT_SOURCE_DIR}/../
+  )
+  NGL_TARGET_LINK_LIBRARIES(LtsPrinting
+    PRIVATE
+      KDReports::KDReports
+      LtsSessionData
+      LtsSession
+      nglsettings
+      ngltools
+    PUBLIC
+      Qt5::PrintSupport
+      Qt5::Core
+  )
+  NGL_INSTALL_TARGET(LtsPrinting)
+else()
+  message(STATUS "KDReports not found; skipping LtsPrinting target")
+endif()