fix version parsing (#257)

CMakeLists.txt

@@ -117,8 +117,15 @@ if(${ENABLE_BUILD_INTO_OPEN62541})
     # v1.2.3-rc1-dirty
     # v1.2.3-5-g4538abcd
     # v1.2.3-5-g4538abcd-dirty
+
+
     string(FIND ${OPEN62541_VERSION} "v" MAIN_VERSIONS_OPEN62541_BEGIN)
     string(FIND ${OPEN62541_VERSION} "-" MAIN_VERSIONS_OPEN62541_END)
+
+    if(${MAIN_VERSIONS_OPEN62541_END} EQUAL -1)
+        string(LENGTH ${OPEN62541_VERSION} MAIN_VERSIONS_OPEN62541_END)
+    endif()
+
     math(EXPR
          MAIN_VERSIONS_OPEN62541_BEGIN
          "${MAIN_VERSIONS_OPEN62541_BEGIN} + 1"
@@ -137,7 +144,6 @@ if(${ENABLE_BUILD_INTO_OPEN62541})
     string(REPLACE "." ";" MAIN_VERSIONS_OPEN62541_LIST ${MAIN_VERSION_OPEN62541})
     list(GET MAIN_VERSIONS_OPEN62541_LIST 0 OPEN62541_MAJOR)
     list(GET MAIN_VERSIONS_OPEN62541_LIST 1 OPEN62541_MINOR)
-    list(GET MAIN_VERSIONS_OPEN62541_LIST 2 OPEN62541_SUBMINOR)
 
     if(NOT(${OPEN62541_MAJOR} GREATER_EQUAL "1" AND ${OPEN62541_MINOR} GREATER_EQUAL "3"))
         message(FATAL_ERROR "This version of nodesetLoader can be built with open62541 >= v1.3.2")