add lens: Olympus M.ZUIKO DIGITAL ED 12-45mm F4.0 PRO (#1725)

* add lens ID for Olympus M.Zuiko Digital ED 12-45mm F4.0 Pro #1723

* add test for #1723 checking the Olympus M.Zuiko Digital ED 12-45mm F4.0 Pro recognized correctly

src/olympusmn_int.cpp

@@ -1313,6 +1313,7 @@ namespace Exiv2 {
             { { 0, 50,  0 }, "Olympus Zuiko Digital ED 14-35mm F2.0 SWD"               },
             { { 0, 51,  0 }, "Olympus Zuiko Digital 25mm F2.8"                         },
             { { 0, 52,  0 }, "Olympus Zuiko Digital ED 9-18mm F4.0-5.6"                },
+            { { 0, 52, 16 }, "Olympus M.Zuiko Digital ED 12-45mm F4.0 Pro"             },
             { { 0, 53,  0 }, "Olympus Zuiko Digital 14-54mm F2.8-3.5 II"               },
             { { 1,  1,  0 }, "Sigma 18-50mm F3.5-5.6 DC"                               },
             { { 1,  1, 16 }, "Sigma 30mm F2.8 EX DN"                                   },

tests/bugfixes/github/test_issue_1723.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+
+import system_tests
+
+class Olympus_MZuiko_12_45mm_f4_Pro(metaclass=system_tests.CaseMeta):
+    url = "https://github.com/Exiv2/exiv2/issues/1723"
+    
+    filename = "$data_path/olympus-m.zuiko-12-45mm-f4-pro.exv"
+    commands  = ["$exiv2 -pa -K Exif.OlympusEq.LensType $filename"]
+    stderr = [""]
+    stdout = ["""Exif.OlympusEq.LensType                      Byte        6  Olympus M.Zuiko Digital ED 12-45mm F4.0 Pro
+"""]
+    retval = [0]