Log warning instead of fatal when parsing float get under/overflow (#4336)

* Log warning instead of fatal when parsing float get under/overflow.

For texts that resolve to infinity, under or overflow should be
accepted.

* Remove outdated unit test.

* empty commit to trigger ci

include/LightGBM/utils/common.h

@@ -347,7 +347,7 @@ inline static const char* AtofPrecise(const char* p, double* out) {
     Log::Fatal("no conversion to double for: %s", p);
   }
   if (errno == ERANGE) {
-    Log::Fatal("convert to double got underflow or overflow: %s", p);
+    Log::Warning("convert to double got underflow or overflow: %s", p);
   }
   return end2;
 }

tests/cpp_tests/test_common.cpp

@@ -103,11 +103,6 @@ TEST_F(AtofPreciseTest, CornerCases) {
   }
 }
 
-TEST_F(AtofPreciseTest, UnderOverFlow) {
-  double got = 0;
-  ASSERT_THROW(LightGBM::Common::AtofPrecise("1e+400", &got),  std::runtime_error);
-}
-
 TEST_F(AtofPreciseTest, ErrorInput) {
   double got = 0;
   ASSERT_THROW(LightGBM::Common::AtofPrecise("x1", &got),  std::runtime_error);