Solved svg2pdf conversion error if Inkscape is installed into the def…

…ault path on a windows machine (#1469)

* fixed typo in major_version

* added an additional variable inkscape_path_string to enclose it in double spaces. Unsure if this change impacts Linux or Mac Systems. But solves my problem on windows

Co-authored-by: Adolph <adolphm@goldbeck.biz>

nbconvert/preprocessors/svg2pdf.py

@@ -74,12 +74,13 @@ def _inkscape_version_default(self):
 
     @default('command')
     def _command_default(self):
-        major_verison = self.inkscape_version.split('.')[0]
-        export_option = ' --export-filename' if int(major_verison) > 0 else ' --export-pdf'
-        gui_option = '' if int(major_verison) > 0 else ' --without-gui'
+        inkscape_path_string = f'\"{self.inkscape}\"'
+        major_version = self.inkscape_version.split('.')[0]
+        export_option = ' --export-filename' if int(major_version) > 0 else ' --export-pdf'
+        gui_option = '' if int(major_version) > 0 else ' --without-gui'
 
         return '{inkscape}{gui_option}{export_option}='.format(
-            inkscape=self.inkscape, export_option=export_option, gui_option=gui_option
+            inkscape=inkscape_path_string, export_option=export_option, gui_option=gui_option
         ) + '"{to_filename}" "{from_filename}"'
 
     inkscape = Unicode(help="The path to Inkscape, if necessary").tag(config=True)