ENH: fix muParser version parsing

CMake/FindMuParser.cmake

@@ -22,6 +22,12 @@ find_path( MUPARSER_INCLUDE_DIR muParser.h
 if(EXISTS "${MUPARSER_INCLUDE_DIR}/muParserDef.h")
   file(READ "${MUPARSER_INCLUDE_DIR}/muParserDef.h" _muParserDef_h_CONTENTS)
   string(REGEX REPLACE ".*# *define MUP_VERSION *_T\\(\"([0-9.]+)\"\\).*" "\\1" MUPARSER_VERSION "${_muParserDef_h_CONTENTS}")
+  if(MUPARSER_VERSION MATCHES "^[0-9]+\$")
+    set(MUPARSER_VERSION "${MUPARSER_VERSION}.0.0")
+  endif()
+  if(MUPARSER_VERSION MATCHES "^[0-9]+\\.[0-9]+\$")
+    set(MUPARSER_VERSION "${MUPARSER_VERSION}.0")
+  endif()
   string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\1" MUPARSER_VERSION_MAJOR "${MUPARSER_VERSION}")
   string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\2" MUPARSER_VERSION_MINOR "${MUPARSER_VERSION}")
   string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\3" MUPARSER_VERSION_PATCH "${MUPARSER_VERSION}")