fix: allow leaving logo-image empty

src/style.typ

@@ -300,7 +300,11 @@
           // we need two, so make both half the page width
           columns: (50%, 50%),
           // left align logo of ABB
-          align(left, image(style.header.logo-image, height: style.header.logo-height)),
+          if style.header.logo-image == none {
+            []
+          } else if style.header.logo-image.len() > 0 {
+            align(left, image(style.header.logo-image, height: style.header.logo-height))
+          },
           // right align logo of DHBW
           align(right, image("res/DHBW.svg", height: style.header.logo-height)))
 

template/main.typ

@@ -31,6 +31,11 @@
     glossary: yaml("glossary.yml"),
     appendices: include "appendix.typ",
   ),
+  style: (
+    header: (
+      logo-image: ""
+    )
+  )
 ))
 
 #import "@preview/wrap-it:0.1.0": wrap-content