analyze: fix ZeroDivisionErrors when report is empty

zodbtools/test/test_analyze.py

@@ -56,3 +56,18 @@ __main__.Object,56,1880,54.366686%,33.571429,9,303,47,1577
         == captured.out
     )
     assert captured.err == ""
+
+    # empty range
+    report(
+        analyze(
+            os.path.join(os.path.dirname(__file__), "testdata", "1.fs"),
+            use_dbm=False,
+            delta_fs=False,
+            tidmin="ffffffffffffffff",
+            tidmax=None,
+        ),
+        csv=False,
+    )
+    captured = capsys.readouterr()
+    assert "No transactions processed\n" == captured.out
+    assert captured.err == ""

zodbtools/zodbanalyze.py

@@ -95,9 +95,10 @@ def report(rep, csv=False):
     delta_fs = rep.delta_fs
     if not csv:
         if rep.TIDS == 0:
-            print "# ø"
-        else:
-            print "# %s..%s" % (ashex(rep.tidmin), ashex(rep.tidmax))
+            print "No transactions processed"
+            return
+
+        print "# %s..%s" % (ashex(rep.tidmin), ashex(rep.tidmax))
         print "Processed %d records in %d transactions" % (rep.OIDS, rep.TIDS)
         print "Average record size is %7.2f bytes" % (rep.DBYTES * 1.0 / rep.OIDS)
         print ("Average transaction size is %7.2f bytes" %