fixed empty workspace bug

meson.build

@@ -1,7 +1,7 @@
 project(
   'sov',
   'c',
-  version: '0.6',
+  version: '0.61',
   license: 'ISC',
   default_options: ['c_std=c99']
 )

src/sov/tree/tree_drawer.c

@@ -52,7 +52,7 @@ void tree_drawer_draw(
     int         wsnum_dy)
 {
     int max = cols;
-    if (workspaces->length > cols)
+    if (workspaces->length > 0)
     {
 	sway_workspace_t* wsl = workspaces->data[workspaces->length - 1];
 	max                   = ceilf((float) wsl->number / cols) * cols;

tst/runtests.sh

@@ -3,12 +3,14 @@ build/test_tree -c tst/config_b -w tst/workspace_a.json -t tst/tree_a.json -o ts
 build/test_tree -c tst/config_a -w tst/workspace_b.json -t tst/tree_b.json -o tst/image_cfga_treeb_test.bmp
 build/test_tree -c tst/config_b -w tst/workspace_b.json -t tst/tree_b.json -o tst/image_cfgb_treeb_test.bmp
 build/test_tree -c tst/config_a -w tst/workspace_empty.json -t tst/tree_empty.json -o tst/image_empty_test.bmp
+build/test_tree -c tst/config_a -w tst/workspace_empty_6.json -t tst/tree_empty_6.json -o tst/image_empty_6_test.bmp
 build/test_tree -c tst/config_a -w tst/workspace_floating.json -t tst/tree_floating.json -o tst/image_floating_test.bmp
 build/test_tree -c tst/config_a -w tst/workspace_feh.json -t tst/tree_feh.json -o tst/image_feh_test.bmp
 diff tst/image_cfga_treea.bmp tst/image_cfga_treea_test.bmp
 diff tst/image_cfgb_treea.bmp tst/image_cfgb_treea_test.bmp
 diff tst/image_cfga_treeb.bmp tst/image_cfga_treeb_test.bmp
 diff tst/image_cfgb_treeb.bmp tst/image_cfgb_treeb_test.bmp
 diff tst/image_empty.bmp tst/image_empty_test.bmp
+diff tst/image_empty_6.bmp tst/image_empty_6_test.bmp
 diff tst/image_feh.bmp tst/image_feh_test.bmp
 diff tst/image_floating.bmp tst/image_floating_test.bmp