Fix error message with invalid containers

[odow]

Closes #1672

[codecov]

Codecov Report

Merging #1679 into master will increase coverage by 0.09%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1679      +/-   ##
==========================================
+ Coverage   67.92%   68.02%   +0.09%     
==========================================
  Files          30       30              
  Lines        3810     3837      +27     
==========================================
+ Hits         2588     2610      +22     
- Misses       1222     1227       +5

Impacted Files	Coverage Δ
src/macros.jl	83.49% <50%> (+0.19%)	⬆️
src/Containers/SparseAxisArray.jl	67.61% <0%> (+3.51%)	⬆️

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[codecov]

Codecov Report

Merging #1679 into master will increase coverage by 0.09%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1679      +/-   ##
==========================================
+ Coverage   67.92%   68.02%   +0.09%     
==========================================
  Files          30       30              
  Lines        3810     3837      +27     
==========================================
+ Hits         2588     2610      +22     
- Misses       1222     1227       +5

Impacted Files	Coverage Δ
src/macros.jl	83.49% <50%> (+0.19%)	⬆️
src/Containers/SparseAxisArray.jl	67.61% <0%> (+3.51%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7afbd14...9122848. Read the comment docs.