[recipes] Don't parse a space as a number

[Matthias Clasen <matthiasc src gnome org>]

commit 10e0307cf80375efdd21b42f53dec4b8e399facd
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 27 18:19:19 2017 -0400

    Don't parse a space as a number
    
    This was unintentional. Add a test that covers this corner case.

 src/gr-number.c                    |    3 ++-
 tests/number-data/number1.expected |    6 +++++-
 tests/number-data/number1.in       |    3 +++
 3 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/gr-number.c b/src/gr-number.c
index e108d9b..9c6d153 100644
--- a/src/gr-number.c
+++ b/src/gr-number.c
@@ -233,7 +233,8 @@ parse_as_float (GrNumber  *number,
 
         value = g_strtod (*input, &end);
 
-        if (end != NULL && !space_or_nul (end[0])) {
+        if (*input == end ||
+            (end != NULL && !space_or_nul (end[0]))) {
                 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                              _("Could not parse %s as a float"), *input);
                 return FALSE;
diff --git a/tests/number-data/number1.expected b/tests/number-data/number1.expected
index 62b48ae..7db3f4b 100644
--- a/tests/number-data/number1.expected
+++ b/tests/number-data/number1.expected
@@ -291,10 +291,14 @@ REST '--2'
 ERROR Could not parse --2 as a number
 
 INPUT '10 11.12'
-REST '11.12'
+REST ' 11.12'
 FRACTION 1
 NUMERATOR 10
 DENOMINATOR 1
 VALUE 10
 FORMATTED '10'
 
+INPUT ' '
+REST ' '
+ERROR Could not parse   as a number
+
diff --git a/tests/number-data/number1.in b/tests/number-data/number1.in
index f1b5ed7..91a7d7c 100644
--- a/tests/number-data/number1.in
+++ b/tests/number-data/number1.in
@@ -44,3 +44,6 @@
 1/2/3
 --2
 10 11.12
+
+# empty text
+