Hide professional degree type if it's empty (#325)

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - 新增选项 `math-font = cm` (Computer Modern)（[#324](https://github.com/ustctug/ustcthesis/issues/324)）。
 - 新增 LuaLaTeX 支持（虽然很慢）。
 
+# Changed
+
+- 专业学位类型 `professional-type` 为空时不再显示括号（[#325](https://github.com/ustctug/ustcthesis/issues/325)）。
+
 ## [v3.3.1] - 2021-12-10
 
 ### Changed

test/testfiles/titlepage-master.tlg

@@ -596,8 +596,8 @@ Completed box being shipped out [3]
 ....\kern 0.00021
 ....\glue 4.015 plus 2.00749 minus 1.33833
 ....\TU/texgyretermes(0)/m/n/16.06 type)
-....\kern -0.0002
-....\kern 0.0002
+....\kern -0.00021
+....\kern 0.00021
 ....\penalty 10000
 ....\glue(\parfillskip) 0.0
 ....\glue(\rightskip) 0.0 plus 1.0fil

ustcthesis.cls

@@ -1859,14 +1859,15 @@
       \vskip 2.0cm%
     \else
       \vskip 0.8cm%
-      {\lishu\fontsize{26bp}{26bp}\selectfont
-        （%
+      \begingroup
+        \fontsize{26bp}{26bp}\selectfont
         \ifx\ustc@professional@type\@empty
-          专业学位类型%
+          \null
         \else
-          \ustc@professional@type
+          \lishu （\ustc@professional@type ）%
         \fi
-        ）\par}%
+        \par
+      \endgroup
       \vskip 1.0cm%
     \fi
     \ifustc@badge@color@blue
@@ -1911,14 +1912,15 @@
     {\sffamily\fontsize{26bp}{30bp}\selectfont
       \ustc@thesis@name@en\par}%
     \ifustc@degree@type@academic\else
-      {\fontsize{16bp}{32bp}\selectfont
-        (%
+      \begingroup
+        \fontsize{16bp}{32bp}\selectfont
         \ifx\ustc@professional@type@en\@empty
-          Professional degree type%
+          \null
         \else
-          \ustc@professional@type@en
+          (\ustc@professional@type@en)
         \fi
-        )\par}%
+        \par
+      \endgroup
     \fi
     \vskip 2.5cm%
     \ifustc@badge@color@blue