fix for air quality error gives seg fault

[Peter Birch]

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..16d9bd2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+monitor
+sparkler
diff --git a/main.c b/main.c
index 1ef2a06..4da836c 100644
--- a/main.c
+++ b/main.c
@@ -295,6 +295,9 @@ int main(void)
                                     strncpy(country, "US", sizeof(country));
                                 }
                                 aq_report = fetch_air_quality(country, city);
+                                if (aq_report == NULL) {
+                                                                       break;
+                                                               }
                             }
                             char aq_chr = *(aq_report + aq_str_idx);
                             *(((char *)run) + run->io.data_offset) = aq_chr;