Per #1019, add StringArray::all_empty() member function to check for …

…a list of all empty strings. This is used in ascii2nc to determine if observation units and descriptions should be written.

src/basic/vx_log/string_array.cc

@@ -560,6 +560,31 @@ bool StringArray::has(const std::string text, int & index, bool forward) const
 ////////////////////////////////////////////////////////////////////////
 
 
+bool StringArray::all_empty() const
+
+{
+
+bool all_empty = true;
+
+   //
+   // Search for non-empty string
+   //
+
+for(auto &x : s) {
+   if(!x.size() == 0) {
+      all_empty = false;
+      break;
+   }
+}
+
+return all_empty;
+
+}
+
+
+////////////////////////////////////////////////////////////////////////
+
+
 void StringArray::parse_wsss(const std::string text)
 
 {

src/basic/vx_log/string_array.h

@@ -90,6 +90,8 @@ class StringArray {
 
       bool has(const std::string, int & index, bool forward=true) const;
 
+      bool all_empty() const;
+
          //
          //  parse delimited strings
          //