fix:xts bug

Signed-off-by: NMupceet <laiguizhong@huawei.com>

interfaces/innerkits/syspara/param_comm.c

@@ -33,7 +33,7 @@ static const char *g_emptyStr = "";
 
 int IsValidValue(const char *value, unsigned int len)
 {
-    if ((value == NULL) || !strlen(value) || (strlen(value) + 1 > len)) {
+    if ((value == NULL) || (strlen(value) + 1 > len)) {
         return 0;
     }
     return 1;

interfaces/innerkits/syspara/param_wrapper.cpp

@@ -66,16 +66,12 @@ std::string GetParameter(const std::string& key, const std::string& def)
 {
     uint32_t size = 0;
     int ret = SystemReadParam(key.c_str(), NULL, &size);
-    if (ret != 0) {
-        if (IsValidValue(def.c_str(), MAX_VALUE_LEN) == 1) {
-            return std::string(def);
-        }
-        return "";
-    }
-    std::vector<char> value(size + 1);
-    ret = SystemReadParam(key.c_str(), value.data(), &size);
     if (ret == 0) {
-        return std::string(value.data());
+        std::vector<char> value(size + 1);
+        ret = SystemReadParam(key.c_str(), value.data(), &size);
+        if (ret == 0) {
+            return std::string(value.data());
+        }
     }
     if (IsValidValue(def.c_str(), MAX_VALUE_LEN) == 1) {
         return std::string(def);