do not mix ttf-specific check results in the webapp tabs

This  is fixed by reseting the check results logger object after outputing each individual report, so that it avoinds accumulating the previous messages.
(issues fonttools#1133 & fonttools#1121)

fontbakery-check-ttf.py

@@ -3767,6 +3767,7 @@ def is_italic():
         fb.ok("Font em size is equal to 1000.")
 
     fb.output_report(font_file)
+    fb.reset_report()
 
     if not webapp:
       # ----------------------------------------------------
@@ -3782,8 +3783,6 @@ def is_italic():
         logging.info("{} saved\n".format(font_file_output))
       font.close()
 
-      fb.reset_report()
-
       # -------------------------------------------------------
       if not config['verbose'] and \
          not config['json'] and \
@@ -3800,8 +3799,6 @@ def is_italic():
                "  --ghm  \tSave results to a file in GitHub Markdown format.\n"
                "  --error\tPrint only the error messages (outputs to stderr).\n")
 
-
-
   if webapp:
     return ghm_report_files
   else: