Make return codes consistent: 1 for no data and 2 for fail_under. Now the `report` command will properly report `No data to report` if there's no data.

2 files changed, 3 insertions, 3 deletions

diff --git a/coverage/html.py b/coverage/html.py
index 9148f422..da23935d 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -126,8 +126,7 @@ class HtmlReporter(Reporter):
         self.index_file()
 
         self.make_local_static_report_files()
-
-        return self.totals.pc_covered
+        return self.totals.n_statements and self.totals.pc_covered
 
     def make_local_static_report_files(self):
         """Make local instances of static files for HTML report."""
diff --git a/coverage/summary.py b/coverage/summary.py
index aed83350..20123ea1 100644
--- a/coverage/summary.py
+++ b/coverage/summary.py
@@ -98,5 +98,6 @@ class SummaryReporter(Reporter):
             if self.config.show_missing:
                 args += ("",)
             outfile.write(fmt_coverage % args)
-
+        if not total.n_files:
+            raise CoverageException("No data to report.")
         return total.n_statements and total.pc_covered