fix the "blank" table ctor calling form (table('Size', sz, 'VariableTypes', vt))

The ctor implementation was trying to use .-indexing to reference table cols/variables, which doesn't work from inside the class's methods. Replaced it with method calls which do work.

Fixes: #145

Author: apjanke

CHANGES.txt

@@ -8,6 +8,7 @@ Tablicious Changelog
   * Add datevec() methods for duration and calendarDuration; add multi-argout form for datetime.datevec(). ([#153](https://github.com/apjanke/octave-tablicious/issues/153))
   * Add duration.hms() method.
 * Fix table.rowfun() bugs that broke it. ([#155](https://github.com/apjanke/octave-tablicious/issues/155))
+* Fix the "blank" ctor calling form (`table ('Size',sz, 'VariableTypes',types)`). ([#145](https://github.com/apjanke/octave-tablicious/issues/145))
 
 0.4.6 (2026-02-16)
 ------------------

inst/@table/table.m

@@ -200,10 +200,10 @@
           varNames = [];
         endif
         blank = tblish.internal.table.blankTable (opts.Size, opts.VariableTypes, varNames, 'ctor');
-        flds = fieldnames (this);
-        for iFld = 1:numel(flds)
-          this.(flds{iFld}) = blank.(flds{iFld});
-        endfor
+        this.VariableNames = blank.VariableNames;
+        this.VariableValues = blank.VariableValues;
+        this.RowNames = blank.RowNames;
+        this.DimensionNames = blank.DimensionNames;
         if (isfield (opts, 'DimensionNames'))
           this = setDimensionNames (this, opts.DimensionNames);
         endif
@@ -1342,6 +1342,7 @@ function prettyprint (this)
     ##
     ## @end deftypefn
     function out = setvar (this, varRef, value)
+      narginchk (3, 3);
       ixVar = resolveVarRef (this, varRef, 'lenient');
       if (! isscalar (ixVar))
         error('table.setvar: Only a single variable is allowed for varRef; got %d', ...